<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e64a9-945c-7c40-8fcd-7a6307d807a6,g:e96255f3-c998-49c2-a73e-e781d80a9221-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.madisonair.com/role/CoverPage" xlink:type="simple" xlink:href="mair-20260630.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019e64a9-95b8-7da4-9f5c-f5e59c6efd43" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_DocumentInformationTable_019e64a9-95b8-7da4-9f5c-f5e59c6efd43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019e64a9-95b8-74a5-bbc4-e64faa74e4bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019e64a9-95b8-7da4-9f5c-f5e59c6efd43" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019e64a9-95b8-74a5-bbc4-e64faa74e4bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e64a9-95b8-74a5-bbc4-e64faa74e4bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e64a9-95b8-74a5-bbc4-e64faa74e4bf" xlink:to="loc_us-gaap_ClassOfStockDomain_019e64a9-95b8-74a5-bbc4-e64faa74e4bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e64a9-95b8-7d21-9da8-438f9c2e7814" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e64a9-95b8-74a5-bbc4-e64faa74e4bf" xlink:to="loc_us-gaap_ClassOfStockDomain_019e64a9-95b8-7d21-9da8-438f9c2e7814" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019e64a9-95b8-795a-b0eb-04c6c6778b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e64a9-95b8-7d21-9da8-438f9c2e7814" xlink:to="loc_us-gaap_CommonClassAMember_019e64a9-95b8-795a-b0eb-04c6c6778b8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019e64a9-95b8-796a-b7d7-6bcce32b3be2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e64a9-95b8-7d21-9da8-438f9c2e7814" xlink:to="loc_us-gaap_CommonClassBMember_019e64a9-95b8-796a-b7d7-6bcce32b3be2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e64a9-95b8-7022-b538-0abcd935e849" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_DocumentType_019e64a9-95b8-7022-b538-0abcd935e849" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019e64a9-95b8-7e6b-98be-6e46caeb3fb2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_DocumentQuarterlyReport_019e64a9-95b8-7e6b-98be-6e46caeb3fb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e64a9-95b8-7085-b29c-67472f650e46" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_DocumentPeriodEndDate_019e64a9-95b8-7085-b29c-67472f650e46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019e64a9-95b8-7ea0-8bc8-a8a76523361f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_DocumentTransitionReport_019e64a9-95b8-7ea0-8bc8-a8a76523361f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e64a9-95b8-7ab6-90a8-31b96c313d51" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityFileNumber_019e64a9-95b8-7ab6-90a8-31b96c313d51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e64a9-95b8-7527-8d44-033a5aa7de24" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityRegistrantName_019e64a9-95b8-7527-8d44-033a5aa7de24" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e64a9-95b8-77a9-9e2a-2846c71903d5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e64a9-95b8-77a9-9e2a-2846c71903d5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e64a9-95b8-71e6-98c0-a2324d181637" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e64a9-95b8-71e6-98c0-a2324d181637" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e64a9-95b8-7554-90b1-9e92fdbe3968" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityAddressAddressLine1_019e64a9-95b8-7554-90b1-9e92fdbe3968" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019e64a9-95b8-7853-a925-ab48fd33dc9b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityAddressAddressLine2_019e64a9-95b8-7853-a925-ab48fd33dc9b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e64a9-95b8-7eac-8619-ed892f63bc94" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityAddressCityOrTown_019e64a9-95b8-7eac-8619-ed892f63bc94" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e64a9-95b8-78fc-894b-c82fb82bb813" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityAddressStateOrProvince_019e64a9-95b8-78fc-894b-c82fb82bb813" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e64a9-95b8-70d1-984e-0a9364cca910" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityAddressPostalZipCode_019e64a9-95b8-70d1-984e-0a9364cca910" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e64a9-95b8-7d20-89fa-d45f83824bf8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_CityAreaCode_019e64a9-95b8-7d20-89fa-d45f83824bf8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e64a9-95b8-70f4-86fb-5c3bb8c8d1b0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_LocalPhoneNumber_019e64a9-95b8-70f4-86fb-5c3bb8c8d1b0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e64a9-95b8-7fb7-b99e-dfdc01dc6df2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_Security12bTitle_019e64a9-95b8-7fb7-b99e-dfdc01dc6df2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e64a9-95b8-7a2f-9619-b7709f59d8a4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_TradingSymbol_019e64a9-95b8-7a2f-9619-b7709f59d8a4" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e64a9-95b8-7a70-9176-d1b58b5c9f10" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_SecurityExchangeName_019e64a9-95b8-7a70-9176-d1b58b5c9f10" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019e64a9-95b8-7ab0-9ead-17b2739dfe11" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityCurrentReportingStatus_019e64a9-95b8-7ab0-9ead-17b2739dfe11" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019e64a9-95b8-7a4f-b336-2d2712292104" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityInteractiveDataCurrent_019e64a9-95b8-7a4f-b336-2d2712292104" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019e64a9-95b8-700b-a34d-c321a8911bd4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityFilerCategory_019e64a9-95b8-700b-a34d-c321a8911bd4" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019e64a9-95b8-7fc2-9835-170eab067d10" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntitySmallBusiness_019e64a9-95b8-7fc2-9835-170eab067d10" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e64a9-95b8-7563-a0ae-039552748c5e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e64a9-95b8-7563-a0ae-039552748c5e" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019e64a9-95b8-768e-b250-eccedd7d1049" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityShellCompany_019e64a9-95b8-768e-b250-eccedd7d1049" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019e64a9-95b8-7ac0-9dba-90af728ebf7b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019e64a9-95b8-7ac0-9dba-90af728ebf7b" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e64a9-95b8-7117-ab1e-f3fddb031995" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_AmendmentFlag_019e64a9-95b8-7117-ab1e-f3fddb031995" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019e64a9-95b8-7444-8f0f-79604fb8f2e0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_DocumentFiscalYearFocus_019e64a9-95b8-7444-8f0f-79604fb8f2e0" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019e64a9-95b8-7e75-a41e-a1b6a25fb8d7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_CurrentFiscalYearEndDate_019e64a9-95b8-7e75-a41e-a1b6a25fb8d7" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019e64a9-95b8-7c88-9b9a-76b55fa5d007" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019e64a9-95b8-7c88-9b9a-76b55fa5d007" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e64a9-95b8-7be9-80e2-9eee2b8297aa" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e64a9-95b8-79e1-b8a8-301df536b9a8" xlink:to="loc_dei_EntityCentralIndexKey_019e64a9-95b8-7be9-80e2-9eee2b8297aa" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/CondensedConsolidatedBalanceSheetsUnaudited" xlink:type="simple" xlink:href="mair-20260630.xsd#CondensedConsolidatedBalanceSheetsUnaudited"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/CondensedConsolidatedBalanceSheetsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019eb649-3bee-7fd8-95db-34e6df83585b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019eb649-3bee-794b-a5de-73a30fa9cf8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019eb649-3bee-7fd8-95db-34e6df83585b" xlink:to="loc_us-gaap_StatementTable_019eb649-3bee-794b-a5de-73a30fa9cf8b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eb649-3bee-744b-a796-723064c45c10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019eb649-3bee-794b-a5de-73a30fa9cf8b" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eb649-3bee-744b-a796-723064c45c10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eb649-3bee-744b-a796-723064c45c10_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019eb649-3bee-744b-a796-723064c45c10" xlink:to="loc_us-gaap_ClassOfStockDomain_019eb649-3bee-744b-a796-723064c45c10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eb649-3bee-799c-8cf1-3262de5b24b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019eb649-3bee-744b-a796-723064c45c10" xlink:to="loc_us-gaap_ClassOfStockDomain_019eb649-3bee-799c-8cf1-3262de5b24b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eb649-d54b-7942-a875-946b99f4bc3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eb649-3bee-799c-8cf1-3262de5b24b5" xlink:to="loc_us-gaap_CommonClassAMember_019eb649-d54b-7942-a875-946b99f4bc3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eb64a-3125-76bf-b55c-d1ea7f8d8a37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eb649-3bee-799c-8cf1-3262de5b24b5" xlink:to="loc_us-gaap_CommonClassBMember_019eb64a-3125-76bf-b55c-d1ea7f8d8a37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eb649-3bee-7fd8-95db-34e6df83585b" xlink:to="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e64a9-95b8-7e73-b5f7-1ce330607f4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e64a9-95b8-7e73-b5f7-1ce330607f4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019e64a9-95b8-7c74-a668-71cd83d3f8f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019e64a9-95b8-7c74-a668-71cd83d3f8f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019e64a9-95b8-7e5e-b77b-2fb8120f5cff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_InventoryNet_019e64a9-95b8-7e5e-b77b-2fb8120f5cff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019e64a9-95b8-736f-8f6e-ef6482c440a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019e64a9-95b8-736f-8f6e-ef6482c440a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019e64a9-95b8-7d65-83bd-2a5e5305461f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_AssetsCurrent_019e64a9-95b8-7d65-83bd-2a5e5305461f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e64a9-95b8-7127-9faa-d011061ff951" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e64a9-95b8-7127-9faa-d011061ff951" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e64a9-95b8-7cbb-bb54-633e61edd84c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_Goodwill_019e64a9-95b8-7cbb-bb54-633e61edd84c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019e64a9-95b8-7ef4-bac5-ef597748fdbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019e64a9-95b8-7ef4-bac5-ef597748fdbb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019e64a9-95b8-731f-b437-3905837bdfc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019e64a9-95b8-731f-b437-3905837bdfc9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e64a9-95b8-72c8-a600-028b341d3788" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e64a9-95b8-740c-b4aa-a75f703ad732" xlink:to="loc_us-gaap_Assets_019e64a9-95b8-72c8-a600-028b341d3788" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eb649-3bee-7fd8-95db-34e6df83585b" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019e64a9-95b8-74f3-a948-ed51d32bf8c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_AccountsPayableCurrent_019e64a9-95b8-74f3-a948-ed51d32bf8c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019e64a9-95b8-799b-a550-0f66bf3aeb06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019e64a9-95b8-799b-a550-0f66bf3aeb06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_019e64a9-95b8-789b-8e90-6dff916eb923" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_019e64a9-95b8-789b-8e90-6dff916eb923" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019e64a9-95b8-73c0-b377-3d0b90fc21e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019e64a9-95b8-73c0-b377-3d0b90fc21e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019e64a9-95b8-74c6-8422-e783de3e93b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_LiabilitiesCurrent_019e64a9-95b8-74c6-8422-e783de3e93b6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019e64a9-95b8-7bc5-a378-116f37635d84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019e64a9-95b8-7bc5-a378-116f37635d84" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019e64a9-95b8-71ef-aa37-61073735561b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019e64a9-95b8-71ef-aa37-61073735561b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019e64a9-95b8-7fbd-a21d-d8ab6be3f7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019e64a9-95b8-7fbd-a21d-d8ab6be3f7a5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e64a9-95b8-7d3e-9131-6167b61e37f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_Liabilities_019e64a9-95b8-7d3e-9131-6167b61e37f1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019e64a9-95b8-757a-9098-929382a1d63c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019e64a9-95b8-757a-9098-929382a1d63c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019e64a9-95b8-71ab-a91a-fca7980f98b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019e64a9-95b8-71ab-a91a-fca7980f98b3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019e64a9-95b8-76cb-b5d8-be4a1b523da2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019e64a9-95b8-76cb-b5d8-be4a1b523da2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019e64a9-95b8-7f04-b59d-6267cd4b2c01" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e64a9-95b8-76cb-b5d8-be4a1b523da2" xlink:to="loc_us-gaap_CommonStockValue_019e64a9-95b8-7f04-b59d-6267cd4b2c01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019e64a9-95b8-7107-9ab8-3961d7b024f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e64a9-95b8-76cb-b5d8-be4a1b523da2" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019e64a9-95b8-7107-9ab8-3961d7b024f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e64a9-95b8-7d93-b37f-4b319e76b4cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e64a9-95b8-76cb-b5d8-be4a1b523da2" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e64a9-95b8-7d93-b37f-4b319e76b4cb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019e64a9-95b8-7154-80ef-7a8e9cb33405" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e64a9-95b8-76cb-b5d8-be4a1b523da2" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019e64a9-95b8-7154-80ef-7a8e9cb33405" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e64a9-95b8-7083-8a7f-6cc302077caf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019e64a9-95b8-76cb-b5d8-be4a1b523da2" xlink:to="loc_us-gaap_StockholdersEquity_019e64a9-95b8-7083-8a7f-6cc302077caf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019e64a9-95b8-792d-ba6d-a34fa6c0607b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_MinorityInterest_019e64a9-95b8-792d-ba6d-a34fa6c0607b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-95b8-7941-9106-0a31039fbfcf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-95b8-7941-9106-0a31039fbfcf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e64a9-95b8-7ee6-a8f0-d16bc47eaf73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e64a9-95b8-7f0d-8d70-f300ecb10a31" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e64a9-95b8-7ee6-a8f0-d16bc47eaf73" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" xlink:href="mair-20260630.xsd#CondensedConsolidatedBalanceSheetsUnauditedParenthetical"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e64a9-95b8-7d41-95e1-446edcb1364d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e64a9-95b8-7c47-b04a-9d3fa96c7850" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-7d41-95e1-446edcb1364d" xlink:to="loc_us-gaap_StatementTable_019e64a9-95b8-7c47-b04a-9d3fa96c7850" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eb658-70e9-7b47-9bab-5f3e97c4ce30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e64a9-95b8-7c47-b04a-9d3fa96c7850" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eb658-70e9-7b47-9bab-5f3e97c4ce30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eb658-70e9-7b47-9bab-5f3e97c4ce30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019eb658-70e9-7b47-9bab-5f3e97c4ce30" xlink:to="loc_us-gaap_ClassOfStockDomain_019eb658-70e9-7b47-9bab-5f3e97c4ce30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eb658-70e9-7c09-9fb1-46c4830177af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019eb658-70e9-7b47-9bab-5f3e97c4ce30" xlink:to="loc_us-gaap_ClassOfStockDomain_019eb658-70e9-7c09-9fb1-46c4830177af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019fa44b-4902-7d4c-8dbe-59167cb46c72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eb658-70e9-7c09-9fb1-46c4830177af" xlink:to="loc_us-gaap_CommonClassAMember_019fa44b-4902-7d4c-8dbe-59167cb46c72" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eb658-70e9-701c-bda7-1a5fb87670c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eb658-70e9-7c09-9fb1-46c4830177af" xlink:to="loc_us-gaap_CommonClassBMember_019eb658-70e9-701c-bda7-1a5fb87670c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019e64a9-95b8-7edb-a048-c931eb2002f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-7d41-95e1-446edcb1364d" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019e64a9-95b8-7edb-a048-c931eb2002f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019e64a9-95b8-7a4f-9572-465ffd6d66b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-7d41-95e1-446edcb1364d" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019e64a9-95b8-7a4f-9572-465ffd6d66b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019e64a9-95b8-72ba-ac7b-a2305acf5192" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-7d41-95e1-446edcb1364d" xlink:to="loc_us-gaap_CommonStockSharesIssued_019e64a9-95b8-72ba-ac7b-a2305acf5192" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e64a9-95b8-7fae-b154-71b6cb574ba6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-7d41-95e1-446edcb1364d" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e64a9-95b8-7fae-b154-71b6cb574ba6" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/CondensedConsolidatedStatementsofShareholdersEquityDeficitandNoncontrollingInterestsUnaudited" xlink:type="simple" xlink:href="mair-20260630.xsd#CondensedConsolidatedStatementsofShareholdersEquityDeficitandNoncontrollingInterestsUnaudited"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/CondensedConsolidatedStatementsofShareholdersEquityDeficitandNoncontrollingInterestsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e64a9-95b8-78c4-9b0a-87af87aac3e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e64a9-95b8-793e-8ce2-9d18ab71b391" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-78c4-9b0a-87af87aac3e8" xlink:to="loc_us-gaap_StatementTable_019e64a9-95b8-793e-8ce2-9d18ab71b391" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-95b8-776c-b447-ef3157b359c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e64a9-95b8-793e-8ce2-9d18ab71b391" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-95b8-776c-b447-ef3157b359c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e64a9-95b8-776c-b447-ef3157b359c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-95b8-776c-b447-ef3157b359c7" xlink:to="loc_us-gaap_EquityComponentDomain_019e64a9-95b8-776c-b447-ef3157b359c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e64a9-95b8-7e55-8f07-c0b56fac6e1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-95b8-776c-b447-ef3157b359c7" xlink:to="loc_us-gaap_EquityComponentDomain_019e64a9-95b8-7e55-8f07-c0b56fac6e1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_019e64a9-95b8-72ed-9b45-5dc12706b6cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e64a9-95b8-7e55-8f07-c0b56fac6e1a" xlink:to="loc_us-gaap_ParentMember_019e64a9-95b8-72ed-9b45-5dc12706b6cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e64a9-95b8-7bc3-9144-de7642bf8647" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019e64a9-95b8-72ed-9b45-5dc12706b6cf" xlink:to="loc_us-gaap_CommonStockMember_019e64a9-95b8-7bc3-9144-de7642bf8647" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e64a9-95b8-74b9-b776-8bb0da0a6244" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019e64a9-95b8-72ed-9b45-5dc12706b6cf" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e64a9-95b8-74b9-b776-8bb0da0a6244" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e64a9-95b8-721b-b5c6-139df8285e1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019e64a9-95b8-72ed-9b45-5dc12706b6cf" xlink:to="loc_us-gaap_RetainedEarningsMember_019e64a9-95b8-721b-b5c6-139df8285e1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-95b8-7e4c-a63e-20d7545fcf4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019e64a9-95b8-72ed-9b45-5dc12706b6cf" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-95b8-7e4c-a63e-20d7545fcf4f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019e64a9-95b8-7680-9ec9-f3fe7fd5c408" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e64a9-95b8-7e55-8f07-c0b56fac6e1a" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019e64a9-95b8-7680-9ec9-f3fe7fd5c408" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019ebbec-50f1-73df-af8a-c04152e5e8c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e64a9-95b8-793e-8ce2-9d18ab71b391" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019ebbec-50f1-73df-af8a-c04152e5e8c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ebbec-50f1-73df-af8a-c04152e5e8c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ebbec-50f1-73df-af8a-c04152e5e8c0" xlink:to="loc_us-gaap_ClassOfStockDomain_019ebbec-50f1-73df-af8a-c04152e5e8c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ebbec-50f1-75b0-8d2d-8cb35dc37f42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ebbec-50f1-73df-af8a-c04152e5e8c0" xlink:to="loc_us-gaap_ClassOfStockDomain_019ebbec-50f1-75b0-8d2d-8cb35dc37f42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019f4c33-707d-7026-a298-561b00a988c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ebbec-50f1-75b0-8d2d-8cb35dc37f42" xlink:to="loc_us-gaap_CommonClassAMember_019f4c33-707d-7026-a298-561b00a988c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019ebbec-8a51-7e4e-ab1d-d96ce3913510" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ebbec-50f1-75b0-8d2d-8cb35dc37f42" xlink:to="loc_us-gaap_CommonClassBMember_019ebbec-8a51-7e4e-ab1d-d96ce3913510" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019f4bfa-8032-72fb-a534-b4afbb166df6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e64a9-95b8-793e-8ce2-9d18ab71b391" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019f4bfa-8032-72fb-a534-b4afbb166df6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f4bfa-8032-72fb-a534-b4afbb166df6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019f4bfa-8032-72fb-a534-b4afbb166df6" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f4bfa-8032-72fb-a534-b4afbb166df6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f4bfa-8032-78b0-8518-e57f1b5e0d63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019f4bfa-8032-72fb-a534-b4afbb166df6" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f4bfa-8032-78b0-8518-e57f1b5e0d63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_019f7ffb-5a07-75f2-9575-1f113df0af26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f4bfa-8032-78b0-8518-e57f1b5e0d63" xlink:to="loc_us-gaap_IPOMember_019f7ffb-5a07-75f2-9575-1f113df0af26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_019f7ffc-7d86-73f6-8cf1-24d34258d328" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f4bfa-8032-78b0-8518-e57f1b5e0d63" xlink:to="loc_us-gaap_PrivatePlacementMember_019f7ffc-7d86-73f6-8cf1-24d34258d328" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-78c4-9b0a-87af87aac3e8" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e64a9-95b8-7d4a-92c4-a5cba568285f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e64a9-95b8-7d4a-92c4-a5cba568285f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-95b8-7953-90f7-13306c1c1493" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-95b8-7953-90f7-13306c1c1493" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AdjustmentsToAdditionalPaidInCapitalIncreaseFromEquityContribution_019eb6c1-758e-7431-947e-21296a84e919" xlink:href="mair-20260630.xsd#mair_AdjustmentsToAdditionalPaidInCapitalIncreaseFromEquityContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_mair_AdjustmentsToAdditionalPaidInCapitalIncreaseFromEquityContribution_019eb6c1-758e-7431-947e-21296a84e919" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AdjustmentsToAdditionalPaidInCapitalDecreaseFromEquityDistributions_019e64a9-95b8-715b-8b91-d004e51200d0" xlink:href="mair-20260630.xsd#mair_AdjustmentsToAdditionalPaidInCapitalDecreaseFromEquityDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_mair_AdjustmentsToAdditionalPaidInCapitalDecreaseFromEquityDistributions_019e64a9-95b8-715b-8b91-d004e51200d0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_019e64a9-95b8-7be5-8294-0f3cc5a2f8a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_019e64a9-95b8-7be5-8294-0f3cc5a2f8a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_OtherComprehensiveIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterestNetOfTax_019eb6cb-b5a8-780e-a343-53e2a27d8432" xlink:href="mair-20260630.xsd#mair_OtherComprehensiveIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterestNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_mair_OtherComprehensiveIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterestNetOfTax_019eb6cb-b5a8-780e-a343-53e2a27d8432" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_019faa75-0e3a-7366-bf07-f6f39ec0c71f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_019faa75-0e3a-7366-bf07-f6f39ec0c71f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019f4c11-beb2-776d-8eb5-ce344abe9dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019f4c11-beb2-776d-8eb5-ce344abe9dfe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019ebbdf-37f7-764d-81c2-1762276201a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019ebbdf-37f7-764d-81c2-1762276201a9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_StockIssuedDuringPeriodSharesExchangeOfNoncontrollingInterest_019f4c0b-29eb-759c-8e2a-7614a631cde8" xlink:href="mair-20260630.xsd#mair_StockIssuedDuringPeriodSharesExchangeOfNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_mair_StockIssuedDuringPeriodSharesExchangeOfNoncontrollingInterest_019f4c0b-29eb-759c-8e2a-7614a631cde8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_StockIssuedDuringPeriodValueExchangeOfNoncontrollingInterest_019ebbe8-8e0d-7eb5-ad3b-3e5346ccac4d" xlink:href="mair-20260630.xsd#mair_StockIssuedDuringPeriodValueExchangeOfNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_mair_StockIssuedDuringPeriodValueExchangeOfNoncontrollingInterest_019ebbe8-8e0d-7eb5-ad3b-3e5346ccac4d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AdjustmentsToAdditionalPaidInCapitalChangeInDeferredTaxAsset_019f4c32-64a3-775d-a1dc-cd020ab5107c" xlink:href="mair-20260630.xsd#mair_AdjustmentsToAdditionalPaidInCapitalChangeInDeferredTaxAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_mair_AdjustmentsToAdditionalPaidInCapitalChangeInDeferredTaxAsset_019f4c32-64a3-775d-a1dc-cd020ab5107c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e64a9-95b8-7f55-81e6-d50b969a458f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e64a9-95b8-7f55-81e6-d50b969a458f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019f8001-bfd5-7a61-990d-9ffba120ac46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019f8001-bfd5-7a61-990d-9ffba120ac46" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_019f7b17-ff3a-78ab-8d03-5d4cebf00a53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_019f7b17-ff3a-78ab-8d03-5d4cebf00a53" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AdjustmentsToAdditionalPaidInCapitalShareSettlement_019faa78-9168-7d5a-897f-2c99dd98cfc5" xlink:href="mair-20260630.xsd#mair_AdjustmentsToAdditionalPaidInCapitalShareSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e64a9-95b8-7cd4-b3e6-6f2c26db4c7c" xlink:to="loc_mair_AdjustmentsToAdditionalPaidInCapitalShareSettlement_019faa78-9168-7d5a-897f-2c99dd98cfc5" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e64a9-95b8-7804-90c5-c1f5c0701cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-95b8-746d-8157-807ef44feeed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e64a9-95b8-78c4-9b0a-87af87aac3e8" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019e64a9-95b8-7f9c-b035-a7651cea5a8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019e64a9-95b8-7f9c-b035-a7651cea5a8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_019f92b9-907b-7f2a-8669-1e3e96aa6567" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_019f92b9-907b-7f2a-8669-1e3e96aa6567" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToRedeemableNoncontrollingInterest_019f92ba-39e3-7677-89cf-5424a98d9412" xlink:href="mair-20260630.xsd#mair_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_mair_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToRedeemableNoncontrollingInterest_019f92ba-39e3-7677-89cf-5424a98d9412" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019f92c3-8005-792d-985b-d4c5fcfa62d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019f92c3-8005-792d-985b-d4c5fcfa62d5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_019f92c4-1a50-77a2-ab0d-7cd9cc0459f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_019f92c4-1a50-77a2-ab0d-7cd9cc0459f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_019f92c6-0b6b-78a2-9727-1d8a6a5d9681" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_019f92c6-0b6b-78a2-9727-1d8a6a5d9681" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TemporaryEquityChangeInRedemptionValue_019e64a9-95b8-7ae9-be81-a83b6407f5a1" xlink:href="mair-20260630.xsd#mair_TemporaryEquityChangeInRedemptionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_mair_TemporaryEquityChangeInRedemptionValue_019e64a9-95b8-7ae9-be81-a83b6407f5a1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TemporaryEquityExchangeOfNoncontrollingInterestsForClassACommonStock_019ebbe5-d6b1-79d0-b433-c633699104bd" xlink:href="mair-20260630.xsd#mair_TemporaryEquityExchangeOfNoncontrollingInterestsForClassACommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019e64a9-95b8-7e5d-940d-fd88e04b4145" xlink:to="loc_mair_TemporaryEquityExchangeOfNoncontrollingInterestsForClassACommonStock_019ebbe5-d6b1-79d0-b433-c633699104bd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019e64a9-95b8-763a-8759-0cb8bc443a8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/IntroductionDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#IntroductionDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/IntroductionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e64a9-95b8-72bb-ab13-4e680a9ed218" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e64a9-95b8-72bb-ab13-4e680a9ed218" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eb71f-22e4-7ef1-b2a4-efc1a54fc61b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e64a9-95b8-72bb-ab13-4e680a9ed218" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eb71f-22e4-7ef1-b2a4-efc1a54fc61b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eb71f-22e4-7ef1-b2a4-efc1a54fc61b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019eb71f-22e4-7ef1-b2a4-efc1a54fc61b" xlink:to="loc_us-gaap_ClassOfStockDomain_019eb71f-22e4-7ef1-b2a4-efc1a54fc61b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eb71f-22e4-768c-aa4a-c868ad873f3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019eb71f-22e4-7ef1-b2a4-efc1a54fc61b" xlink:to="loc_us-gaap_ClassOfStockDomain_019eb71f-22e4-768c-aa4a-c868ad873f3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eb71f-22e4-727c-bfd3-3432d80c474a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eb71f-22e4-768c-aa4a-c868ad873f3a" xlink:to="loc_us-gaap_CommonClassAMember_019eb71f-22e4-727c-bfd3-3432d80c474a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eb71f-22e4-79bc-acad-d98a04ec8d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eb71f-22e4-768c-aa4a-c868ad873f3a" xlink:to="loc_us-gaap_CommonClassBMember_019eb71f-22e4-79bc-acad-d98a04ec8d8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019eb71f-22e4-7340-8c3c-5c03d7b145f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e64a9-95b8-72bb-ab13-4e680a9ed218" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019eb71f-22e4-7340-8c3c-5c03d7b145f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019eb71f-22e4-7340-8c3c-5c03d7b145f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019eb71f-22e4-7340-8c3c-5c03d7b145f4" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019eb71f-22e4-7340-8c3c-5c03d7b145f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019eb71f-22e4-79ca-af5e-7f5c7629437f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019eb71f-22e4-7340-8c3c-5c03d7b145f4" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019eb71f-22e4-79ca-af5e-7f5c7629437f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_019eb71f-22e4-7494-89a7-357afd4486cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019eb71f-22e4-79ca-af5e-7f5c7629437f" xlink:to="loc_us-gaap_IPOMember_019eb71f-22e4-7494-89a7-357afd4486cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_019eb71f-22e4-7157-9717-43f4a152a2f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019eb71f-22e4-79ca-af5e-7f5c7629437f" xlink:to="loc_us-gaap_PrivatePlacementMember_019eb71f-22e4-7157-9717-43f4a152a2f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019f4bc9-f292-7252-8a20-0dfe9489d14c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e64a9-95b8-72bb-ab13-4e680a9ed218" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019f4bc9-f292-7252-8a20-0dfe9489d14c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019f4bc9-f292-7252-8a20-0dfe9489d14c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019f4bc9-f292-7252-8a20-0dfe9489d14c" xlink:to="loc_us-gaap_EquityComponentDomain_019f4bc9-f292-7252-8a20-0dfe9489d14c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019f4bc9-f292-7e66-adfd-e013f07bdcc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019f4bc9-f292-7252-8a20-0dfe9489d14c" xlink:to="loc_us-gaap_EquityComponentDomain_019f4bc9-f292-7e66-adfd-e013f07bdcc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019f4bca-41ed-76fc-bef0-56e034583f57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019f4bc9-f292-7e66-adfd-e013f07bdcc6" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019f4bca-41ed-76fc-bef0-56e034583f57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e64a9-95b8-7cee-baec-b005a5154f27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e64a9-95b8-7cee-baec-b005a5154f27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019eb71f-22e4-73c9-95a4-f6d806a30e11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019eb71f-22e4-73c9-95a4-f6d806a30e11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019eb71f-22e4-7def-92b4-7a91b6145248" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019eb71f-22e4-7def-92b4-7a91b6145248" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019eb71f-22e4-7a57-80d0-2ee4c3f2017b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019eb71f-22e4-7a57-80d0-2ee4c3f2017b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_019ebc45-022d-7576-bc7b-b007655f2aff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_019ebc45-022d-7576-bc7b-b007655f2aff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019f4bc3-c2b9-73df-bd33-ffce2babb40f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019f4bc3-c2b9-73df-bd33-ffce2babb40f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019f4bc9-13fa-799a-9943-730ecf032ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019f4bc9-13fa-799a-9943-730ecf032ccd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_StockIssuedDuringPeriodSharesExchangeOfNoncontrollingInterest_019faa95-6f4d-763e-b702-66551e7923d8" xlink:href="mair-20260630.xsd#mair_StockIssuedDuringPeriodSharesExchangeOfNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_mair_StockIssuedDuringPeriodSharesExchangeOfNoncontrollingInterest_019faa95-6f4d-763e-b702-66551e7923d8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CommonStockVotingRightsVotesEntitled_019f4bd0-6a2a-756e-822b-7e8909d8c0c8" xlink:href="mair-20260630.xsd#mair_CommonStockVotingRightsVotesEntitled"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_mair_CommonStockVotingRightsVotesEntitled_019f4bd0-6a2a-756e-822b-7e8909d8c0c8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CommonStockSharesOwnershipPercentage_019fa6a1-d7e9-747b-aea4-79fb4d297b55" xlink:href="mair-20260630.xsd#mair_CommonStockSharesOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_mair_CommonStockSharesOwnershipPercentage_019fa6a1-d7e9-747b-aea4-79fb4d297b55" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CommonStockVotingRightsPercentage_019fa6a3-2eec-7835-aff9-295ea5446228" xlink:href="mair-20260630.xsd#mair_CommonStockVotingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e64a9-95b8-7256-8072-4048998ca2a2" xlink:to="loc_mair_CommonStockVotingRightsPercentage_019fa6a3-2eec-7835-aff9-295ea5446228" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7f64-be14-cc3d3480eeab_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7f64-be14-cc3d3480eeab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7072-a596-91881124615f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7072-a596-91881124615f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CustomerOneMember_019e64a9-95b8-7d63-ac6d-bee064e4c143" xlink:href="mair-20260630.xsd#mair_CustomerOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7072-a596-91881124615f" xlink:to="loc_mair_CustomerOneMember_019e64a9-95b8-7d63-ac6d-bee064e4c143" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-79d3-98a1-17d025992c73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-79d3-98a1-17d025992c73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_019e64a9-95b8-7e2c-ba1a-80d0b307c3b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:to="loc_us-gaap_SalesRevenueNetMember_019e64a9-95b8-7e2c-ba1a-80d0b307c3b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_019e64a9-95b8-774f-994c-b0fb54862575" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:to="loc_us-gaap_AccountsReceivableMember_019e64a9-95b8-774f-994c-b0fb54862575" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-717a-99bd-8a66208a8d9f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-717a-99bd-8a66208a8d9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-753c-a62c-4d08bb2ffbf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-753c-a62c-4d08bb2ffbf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019e64a9-95b8-7408-83a4-7aafca1cc158" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-753c-a62c-4d08bb2ffbf0" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019e64a9-95b8-7408-83a4-7aafca1cc158" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e64a9-95b8-7981-9808-81c045741b50_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:to="loc_srt_RangeMember_019e64a9-95b8-7981-9808-81c045741b50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:to="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e64a9-95b8-7d7e-a66d-cbb2797cbecf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:to="loc_srt_MinimumMember_019e64a9-95b8-7d7e-a66d-cbb2797cbecf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e64a9-95b8-7506-9682-dcf55407cbba" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:to="loc_srt_MaximumMember_019e64a9-95b8-7506-9682-dcf55407cbba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e64a9-95b8-78df-bc74-14127902a96d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e64a9-95b8-78df-bc74-14127902a96d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e64a9-95b8-7d7d-bbff-a031f0b7cbf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e64a9-95b8-7d7d-bbff-a031f0b7cbf8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e64a9-95b8-7c36-9fb8-518a57ba22f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e64a9-95b8-7c36-9fb8-518a57ba22f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e64a9-95b8-7efe-9d01-a60a147c680f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e64a9-95b8-7efe-9d01-a60a147c680f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e64a9-95b8-7100-b08c-12c7886bfe22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e64a9-95b8-7100-b08c-12c7886bfe22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e64a9-95b8-74b5-bd9e-9c26b945aa30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e64a9-95b8-74b5-bd9e-9c26b945aa30" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="simple" xlink:href="mair-20260630.xsd#RevenueRecognitionNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7f64-be14-cc3d3480eeab_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7f64-be14-cc3d3480eeab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7072-a596-91881124615f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019e64a9-95b8-7f64-be14-cc3d3480eeab" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7072-a596-91881124615f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CustomerOneMember_019e64a9-95b8-7d63-ac6d-bee064e4c143" xlink:href="mair-20260630.xsd#mair_CustomerOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019e64a9-95b8-7072-a596-91881124615f" xlink:to="loc_mair_CustomerOneMember_019e64a9-95b8-7d63-ac6d-bee064e4c143" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-79d3-98a1-17d025992c73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-79d3-98a1-17d025992c73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e64a9-95b8-79d3-98a1-17d025992c73" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_019e64a9-95b8-7e2c-ba1a-80d0b307c3b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:to="loc_us-gaap_SalesRevenueNetMember_019e64a9-95b8-7e2c-ba1a-80d0b307c3b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_019e64a9-95b8-774f-994c-b0fb54862575" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e64a9-95b8-7d9a-bc39-30fb19f3d1b0" xlink:to="loc_us-gaap_AccountsReceivableMember_019e64a9-95b8-774f-994c-b0fb54862575" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-717a-99bd-8a66208a8d9f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-717a-99bd-8a66208a8d9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-753c-a62c-4d08bb2ffbf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e64a9-95b8-717a-99bd-8a66208a8d9f" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-753c-a62c-4d08bb2ffbf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019e64a9-95b8-7408-83a4-7aafca1cc158" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e64a9-95b8-753c-a62c-4d08bb2ffbf0" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019e64a9-95b8-7408-83a4-7aafca1cc158" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-7c8c-8b4f-846adf3fe60f" xlink:to="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e64a9-95b8-7981-9808-81c045741b50_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:to="loc_srt_RangeMember_019e64a9-95b8-7981-9808-81c045741b50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e64a9-95b8-7981-9808-81c045741b50" xlink:to="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e64a9-95b8-7d7e-a66d-cbb2797cbecf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:to="loc_srt_MinimumMember_019e64a9-95b8-7d7e-a66d-cbb2797cbecf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e64a9-95b8-7506-9682-dcf55407cbba" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e64a9-95b8-7b49-b77d-e53897804ead" xlink:to="loc_srt_MaximumMember_019e64a9-95b8-7506-9682-dcf55407cbba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e64a9-95b8-7d7d-bbff-a031f0b7cbf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e64a9-95b8-7d7d-bbff-a031f0b7cbf8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e64a9-95b8-7c36-9fb8-518a57ba22f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e64a9-95b8-7c36-9fb8-518a57ba22f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e64a9-95b8-7efe-9d01-a60a147c680f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e64a9-95b8-7efe-9d01-a60a147c680f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e64a9-95b8-7100-b08c-12c7886bfe22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e64a9-95b8-7100-b08c-12c7886bfe22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e64a9-95b8-74b5-bd9e-9c26b945aa30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7ac4-be97-1e09fa1c8db0" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e64a9-95b8-74b5-bd9e-9c26b945aa30" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/RevenueRecognitionSalesdisaggregatedbythetimingoftransferDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#RevenueRecognitionSalesdisaggregatedbythetimingoftransferDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/RevenueRecognitionSalesdisaggregatedbythetimingoftransferDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7c4f-8438-7041699b3cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-794f-8264-d9463dcd9f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7c4f-8438-7041699b3cc9" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-794f-8264-d9463dcd9f7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e64a9-95b8-7d16-82c2-a3e6a3a8e6d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e64a9-95b8-794f-8264-d9463dcd9f7c" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e64a9-95b8-7d16-82c2-a3e6a3a8e6d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e64a9-95b8-7d16-82c2-a3e6a3a8e6d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e64a9-95b8-7d16-82c2-a3e6a3a8e6d5" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e64a9-95b8-7d16-82c2-a3e6a3a8e6d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e64a9-95b8-7b8f-b355-05fb294f4de4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e64a9-95b8-7d16-82c2-a3e6a3a8e6d5" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e64a9-95b8-7b8f-b355-05fb294f4de4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_019e64a9-95b8-7c1d-b3f6-90894a63c1a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e64a9-95b8-7b8f-b355-05fb294f4de4" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_019e64a9-95b8-7c1d-b3f6-90894a63c1a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_019e64a9-95b8-77fd-b097-92de4d47eef2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e64a9-95b8-7b8f-b355-05fb294f4de4" xlink:to="loc_us-gaap_TransferredOverTimeMember_019e64a9-95b8-77fd-b097-92de4d47eef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e64a9-95b8-7a38-8906-b7762be5393c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e64a9-95b8-7c4f-8438-7041699b3cc9" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e64a9-95b8-7a38-8906-b7762be5393c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/FairValueofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#FairValueofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/FairValueofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e64a9-9671-752f-a6f5-de30ba315016" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e64a9-9671-7496-9a00-63781a203516" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e64a9-9671-752f-a6f5-de30ba315016" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e64a9-9671-7496-9a00-63781a203516" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e64a9-9671-78cd-b8b1-3829931ddc14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e64a9-9671-7496-9a00-63781a203516" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e64a9-9671-78cd-b8b1-3829931ddc14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e64a9-9671-78cd-b8b1-3829931ddc14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e64a9-9671-78cd-b8b1-3829931ddc14" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e64a9-9671-78cd-b8b1-3829931ddc14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e64a9-9671-7006-b45e-f8895946cce1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e64a9-9671-78cd-b8b1-3829931ddc14" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e64a9-9671-7006-b45e-f8895946cce1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e64a9-9671-74a6-93a5-310267964266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e64a9-9671-7006-b45e-f8895946cce1" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e64a9-9671-74a6-93a5-310267964266" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e64a9-9671-7366-adb5-f7ab65db5993" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e64a9-9671-7006-b45e-f8895946cce1" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e64a9-9671-7366-adb5-f7ab65db5993" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e64a9-9671-7158-842b-d6e7d6281065" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e64a9-9671-7006-b45e-f8895946cce1" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e64a9-9671-7158-842b-d6e7d6281065" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-72e5-936e-06fb5ef58b38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e64a9-9671-7496-9a00-63781a203516" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-72e5-936e-06fb5ef58b38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-72e5-936e-06fb5ef58b38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-72e5-936e-06fb5ef58b38" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-72e5-936e-06fb5ef58b38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-79d4-9bcc-cb05c1a4edb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-72e5-936e-06fb5ef58b38" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-79d4-9bcc-cb05c1a4edb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e64a9-9671-784a-9246-6e2ef5b996bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-79d4-9bcc-cb05c1a4edb7" xlink:to="loc_us-gaap_InterestRateContractMember_019e64a9-9671-784a-9246-6e2ef5b996bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-7d89-8ef1-5f0b4242f7ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-79d4-9bcc-cb05c1a4edb7" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-7d89-8ef1-5f0b4242f7ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e64a9-9671-70ee-bb96-1e6d7310a318" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e64a9-9671-752f-a6f5-de30ba315016" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e64a9-9671-70ee-bb96-1e6d7310a318" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019e64a9-9671-7882-960a-61c329c3a122" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e64a9-9671-752f-a6f5-de30ba315016" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019e64a9-9671-7882-960a-61c329c3a122" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetAssetLiability_019e64a9-9671-741d-9e5e-88402bd89faa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetAssetLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e64a9-9671-752f-a6f5-de30ba315016" xlink:to="loc_us-gaap_FairValueNetAssetLiability_019e64a9-9671-741d-9e5e-88402bd89faa" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/BusinessAcquisitionsandDivestituresDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#BusinessAcquisitionsandDivestituresDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/BusinessAcquisitionsandDivestituresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019ebbcc-96d6-7e84-8587-8d12985890b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019ebbcc-96d6-7e84-8587-8d12985890b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019ebbcd-a59b-717c-9945-ff699ef0368e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019ebbcc-96d6-7e84-8587-8d12985890b1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019ebbcd-a59b-717c-9945-ff699ef0368e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019ebbcd-a59b-717c-9945-ff699ef0368e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019ebbcd-a59b-717c-9945-ff699ef0368e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019ebbcd-a59b-717c-9945-ff699ef0368e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019ebbcd-a59b-7329-8b08-44700f6fc5d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019ebbcd-a59b-717c-9945-ff699ef0368e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019ebbcd-a59b-7329-8b08-44700f6fc5d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AprilAireMember_019ebbce-007d-7d3b-9f09-5f8a2c4a6a29" xlink:href="mair-20260630.xsd#mair_AprilAireMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019ebbcd-a59b-7329-8b08-44700f6fc5d7" xlink:to="loc_mair_AprilAireMember_019ebbce-007d-7d3b-9f09-5f8a2c4a6a29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_BusinessCombinationConsiderationTransferredContributedCapital_019ebbcc-96d6-7b6d-be9d-a5d50652f967" xlink:href="mair-20260630.xsd#mair_BusinessCombinationConsiderationTransferredContributedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_mair_BusinessCombinationConsiderationTransferredContributedCapital_019ebbcc-96d6-7b6d-be9d-a5d50652f967" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019ebbd0-5615-7a28-9453-9dc12d56464f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019ebbd0-5615-7a28-9453-9dc12d56464f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_BusinessCombinationConsiderationTransferredLongTermDebt_019ebbd2-5c2e-767a-9137-6f9cf88959ed" xlink:href="mair-20260630.xsd#mair_BusinessCombinationConsiderationTransferredLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_mair_BusinessCombinationConsiderationTransferredLongTermDebt_019ebbd2-5c2e-767a-9137-6f9cf88959ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019ebbd3-ef07-71d4-af28-85ccd84bf6d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019ebbd3-ef07-71d4-af28-85ccd84bf6d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019f9228-51f8-713b-98c0-b0a78a527beb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019f9228-51f8-713b-98c0-b0a78a527beb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019f8288-20ea-775d-86f7-b6c95b0ac5e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019f8288-20ea-775d-86f7-b6c95b0ac5e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_BusinessCombinationContingentConsiderationPeriod_019f8292-ef33-796f-aafe-10757bd65349" xlink:href="mair-20260630.xsd#mair_BusinessCombinationContingentConsiderationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_mair_BusinessCombinationContingentConsiderationPeriod_019f8292-ef33-796f-aafe-10757bd65349" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019f924f-74f5-7953-943c-8b0db09fd28f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019f924f-74f5-7953-943c-8b0db09fd28f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_019f9251-1d8a-74eb-a148-c80a890f1371" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_019f9251-1d8a-74eb-a148-c80a890f1371" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_019f4aec-2daf-70e6-ac38-bf69e0f0f003" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019ebbcc-96d6-7820-b695-1f3d5880ea89" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_019f4aec-2daf-70e6-ac38-bf69e0f0f003" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/GoodwillandOtherIntangibleAssetsGoodwillDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#GoodwillandOtherIntangibleAssetsGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/GoodwillandOtherIntangibleAssetsGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019e64a9-9671-7491-8066-e3134e3294d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019e64a9-9671-7428-8568-b4983b6f0027" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019e64a9-9671-7491-8066-e3134e3294d3" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019e64a9-9671-7428-8568-b4983b6f0027" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9671-75dc-a386-a6f3361db0d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019e64a9-9671-7428-8568-b4983b6f0027" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9671-75dc-a386-a6f3361db0d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e64a9-9671-75dc-a386-a6f3361db0d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9671-75dc-a386-a6f3361db0d6" xlink:to="loc_us-gaap_SegmentDomain_019e64a9-9671-75dc-a386-a6f3361db0d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e64a9-9671-7fe1-b277-f8509051a0db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9671-75dc-a386-a6f3361db0d6" xlink:to="loc_us-gaap_SegmentDomain_019e64a9-9671-7fe1-b277-f8509051a0db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CommercialSegmentMember_019e64a9-9671-7e4f-b914-33ab2eb582cd" xlink:href="mair-20260630.xsd#mair_CommercialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e64a9-9671-7fe1-b277-f8509051a0db" xlink:to="loc_mair_CommercialSegmentMember_019e64a9-9671-7e4f-b914-33ab2eb582cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_ResidentialSegmentMember_019e64a9-9671-742e-8a5d-afd99c0f87c3" xlink:href="mair-20260630.xsd#mair_ResidentialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e64a9-9671-7fe1-b277-f8509051a0db" xlink:to="loc_mair_ResidentialSegmentMember_019e64a9-9671-742e-8a5d-afd99c0f87c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019e64a9-9671-738a-a7b0-06c512bb4d05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019e64a9-9671-7491-8066-e3134e3294d3" xlink:to="loc_us-gaap_GoodwillRollForward_019e64a9-9671-738a-a7b0-06c512bb4d05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e64a9-9671-70d8-bf19-92db65f53e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e64a9-9671-738a-a7b0-06c512bb4d05" xlink:to="loc_us-gaap_Goodwill_019e64a9-9671-70d8-bf19-92db65f53e9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019e64a9-9671-7bea-9e87-21f1a6866427" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e64a9-9671-738a-a7b0-06c512bb4d05" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019e64a9-9671-7bea-9e87-21f1a6866427" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e64a9-9671-7726-afbd-ae3d70bb384e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/GoodwillandOtherIntangibleAssetsOtherIntangibleAssetsSubjecttoAmortizationDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#GoodwillandOtherIntangibleAssetsOtherIntangibleAssetsSubjecttoAmortizationDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/GoodwillandOtherIntangibleAssetsOtherIntangibleAssetsSubjecttoAmortizationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019e64a9-9671-7d7b-b55f-04848ae16651" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019e64a9-9671-77dd-94c4-fc97009e51c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019e64a9-9671-7d7b-b55f-04848ae16651" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019e64a9-9671-77dd-94c4-fc97009e51c3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7514-af56-73385bd940f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019e64a9-9671-77dd-94c4-fc97009e51c3" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7514-af56-73385bd940f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-7514-af56-73385bd940f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7514-af56-73385bd940f0" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-7514-af56-73385bd940f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-7d72-8aa9-2fa899c3529c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7514-af56-73385bd940f0" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-7d72-8aa9-2fa899c3529c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_019e64a9-9671-7548-a43f-ab9c527ea3c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-7d72-8aa9-2fa899c3529c" xlink:to="loc_us-gaap_TrademarksMember_019e64a9-9671-7548-a43f-ab9c527ea3c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019e64a9-9671-72fa-a78a-52b2a4ccff3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019e64a9-9671-7d7b-b55f-04848ae16651" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019e64a9-9671-72fa-a78a-52b2a4ccff3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e64a9-9671-792c-8b6e-898b9667eccb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e64a9-9671-7909-ab76-9922fdaf2282" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e64a9-9671-792c-8b6e-898b9667eccb" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e64a9-9671-7909-ab76-9922fdaf2282" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7ea3-9402-f577b63b0b17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e64a9-9671-7909-ab76-9922fdaf2282" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7ea3-9402-f577b63b0b17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-7ea3-9402-f577b63b0b17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7ea3-9402-f577b63b0b17" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-7ea3-9402-f577b63b0b17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-751a-bd10-1726d7060a14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e64a9-9671-7ea3-9402-f577b63b0b17" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-751a-bd10-1726d7060a14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019e64a9-9671-7b55-a7e3-7aa2463cc2cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-751a-bd10-1726d7060a14" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019e64a9-9671-7b55-a7e3-7aa2463cc2cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_019e64a9-9671-7b89-8086-48916c1ab9ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-751a-bd10-1726d7060a14" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_019e64a9-9671-7b89-8086-48916c1ab9ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_019e64a9-9671-7628-b840-1e844854c0d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-751a-bd10-1726d7060a14" xlink:to="loc_us-gaap_PatentsMember_019e64a9-9671-7628-b840-1e844854c0d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_OrderOrProductionBacklogAndOtherIntangibleAssetsMember_019e64a9-9671-77bb-95c6-90a9d752b338" xlink:href="mair-20260630.xsd#mair_OrderOrProductionBacklogAndOtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e64a9-9671-751a-bd10-1726d7060a14" xlink:to="loc_mair_OrderOrProductionBacklogAndOtherIntangibleAssetsMember_019e64a9-9671-77bb-95c6-90a9d752b338" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e64a9-9671-767e-a0c3-0d5a5417770c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e64a9-9671-792c-8b6e-898b9667eccb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e64a9-9671-767e-a0c3-0d5a5417770c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e64a9-9671-7538-a45c-75262d791948" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e64a9-9671-792c-8b6e-898b9667eccb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e64a9-9671-7538-a45c-75262d791948" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e64a9-9671-799a-81e6-6c406c421622" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e64a9-9671-792c-8b6e-898b9667eccb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e64a9-9671-799a-81e6-6c406c421622" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/PropertyPlantandEquipmentScheduleofDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#PropertyPlantandEquipmentScheduleofDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/PropertyPlantandEquipmentScheduleofDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e64a9-9671-7449-90e1-db53080d6f31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e64a9-9671-76a1-bd3d-90cf14f9dec8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e64a9-9671-7449-90e1-db53080d6f31" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e64a9-9671-76a1-bd3d-90cf14f9dec8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-79ee-9db8-e96f76b56543" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e64a9-9671-76a1-bd3d-90cf14f9dec8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-79ee-9db8-e96f76b56543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-79ee-9db8-e96f76b56543_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-79ee-9db8-e96f76b56543" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-79ee-9db8-e96f76b56543_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-70cc-8ee7-7273828757c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-79ee-9db8-e96f76b56543" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-70cc-8ee7-7273828757c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_019e64a9-9671-73a0-9b77-4b607fe74467" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-70cc-8ee7-7273828757c9" xlink:to="loc_us-gaap_LandMember_019e64a9-9671-73a0-9b77-4b607fe74467" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_019e64a9-9671-74d9-8ce0-b3e74792de1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-70cc-8ee7-7273828757c9" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_019e64a9-9671-74d9-8ce0-b3e74792de1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_019e64a9-9671-7ec6-93d2-a4958f179692" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-70cc-8ee7-7273828757c9" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_019e64a9-9671-7ec6-93d2-a4958f179692" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_019e64a9-9671-79ca-83ba-6e05f7120aad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-70cc-8ee7-7273828757c9" xlink:to="loc_us-gaap_ConstructionInProgressMember_019e64a9-9671-79ca-83ba-6e05f7120aad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019e64a9-9671-7fef-9036-0791a45c5354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e64a9-9671-7449-90e1-db53080d6f31" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019e64a9-9671-7fef-9036-0791a45c5354" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_019e64a9-9671-72b9-a76a-9463527f7b94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e64a9-9671-7449-90e1-db53080d6f31" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_019e64a9-9671-72b9-a76a-9463527f7b94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019e64a9-9671-7308-8f65-b81bbd4376fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e64a9-9671-7449-90e1-db53080d6f31" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019e64a9-9671-7308-8f65-b81bbd4376fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019e64a9-9671-76e2-8ed2-6e4f79d27e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e64a9-9671-7449-90e1-db53080d6f31" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019e64a9-9671-76e2-8ed2-6e4f79d27e3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e64a9-9671-75e9-b82a-03aa4222caa5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e64a9-9671-7449-90e1-db53080d6f31" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e64a9-9671-75e9-b82a-03aa4222caa5" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/AccruedExpensesandOtherCurrentLiabilitiesNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#AccruedExpensesandOtherCurrentLiabilitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/AccruedExpensesandOtherCurrentLiabilitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019f6b95-956f-7490-aa63-0a2ace1a5b73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f6b95-956f-7c8f-92dc-d088df94130c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f6b95-956f-7490-aa63-0a2ace1a5b73" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f6b95-956f-7c8f-92dc-d088df94130c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019f6b95-956f-7dc3-bf4f-7c4f8779012a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019f6b95-956f-7c8f-92dc-d088df94130c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019f6b95-956f-7dc3-bf4f-7c4f8779012a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6b95-956f-7dc3-bf4f-7c4f8779012a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f6b95-956f-7dc3-bf4f-7c4f8779012a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6b95-956f-7dc3-bf4f-7c4f8779012a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6b95-956f-7bf9-bb82-19ff38e93e75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019f6b95-956f-7dc3-bf4f-7c4f8779012a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6b95-956f-7bf9-bb82-19ff38e93e75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AprilAireMember_019f6b95-956f-71c6-a9d7-36b15b75789a" xlink:href="mair-20260630.xsd#mair_AprilAireMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019f6b95-956f-7bf9-bb82-19ff38e93e75" xlink:to="loc_mair_AprilAireMember_019f6b95-956f-71c6-a9d7-36b15b75789a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_BusinessCombinationContingentConsiderationChangeInContingentConsiderationLiabilityIncreaseDecreaseCurrent_019f95e6-1811-73e7-8b93-248ba3f5a166" xlink:href="mair-20260630.xsd#mair_BusinessCombinationContingentConsiderationChangeInContingentConsiderationLiabilityIncreaseDecreaseCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019f6b95-956f-7490-aa63-0a2ace1a5b73" xlink:to="loc_mair_BusinessCombinationContingentConsiderationChangeInContingentConsiderationLiabilityIncreaseDecreaseCurrent_019f95e6-1811-73e7-8b93-248ba3f5a166" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/DebtScheduleofDebtDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#DebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/DebtScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-7eec-ba95-ab0653a8209a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:to="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-7eec-ba95-ab0653a8209a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e64a9-9671-7fe5-9118-382efe055298" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-7eec-ba95-ab0653a8209a" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e64a9-9671-7fe5-9118-382efe055298" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e64a9-9671-7fe5-9118-382efe055298_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e64a9-9671-7fe5-9118-382efe055298" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e64a9-9671-7fe5-9118-382efe055298_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e64a9-9671-765a-ba65-3062e6f2de4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e64a9-9671-7fe5-9118-382efe055298" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e64a9-9671-765a-ba65-3062e6f2de4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CreditAgreementMember_019e64a9-9671-7022-a96a-cc0a5508549b" xlink:href="mair-20260630.xsd#mair_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e64a9-9671-765a-ba65-3062e6f2de4d" xlink:to="loc_mair_CreditAgreementMember_019e64a9-9671-7022-a96a-cc0a5508549b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e64a9-9671-768e-a4f7-9cbb24465982" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-7eec-ba95-ab0653a8209a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e64a9-9671-768e-a4f7-9cbb24465982" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-768e-a4f7-9cbb24465982_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e64a9-9671-768e-a4f7-9cbb24465982" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-768e-a4f7-9cbb24465982_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-74a3-a870-cefc503d08d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e64a9-9671-768e-a4f7-9cbb24465982" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-74a3-a870-cefc503d08d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e64a9-9671-7618-849b-c493c1dd0df9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-74a3-a870-cefc503d08d2" xlink:to="loc_us-gaap_LineOfCreditMember_019e64a9-9671-7618-849b-c493c1dd0df9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019e64a9-9671-7c6b-ada1-25d1aed1531e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-74a3-a870-cefc503d08d2" xlink:to="loc_us-gaap_SeniorNotesMember_019e64a9-9671-7c6b-ada1-25d1aed1531e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019e64a9-9671-740d-af8a-c8e31a3d3160" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-74a3-a870-cefc503d08d2" xlink:to="loc_us-gaap_SecuredDebtMember_019e64a9-9671-740d-af8a-c8e31a3d3160" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019e64a9-9671-7370-967a-2bfe76a8c10b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e64a9-9671-74a3-a870-cefc503d08d2" xlink:to="loc_us-gaap_MortgagesMember_019e64a9-9671-7370-967a-2bfe76a8c10b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e64a9-9671-7de1-9e29-abc8d48515e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e64a9-9671-7de1-9e29-abc8d48515e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_019e64a9-9671-795a-9891-49ad23304f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:to="loc_us-gaap_FinanceLeaseLiability_019e64a9-9671-795a-9891-49ad23304f3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e64a9-9671-71fa-8451-fde5aaeb5e98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e64a9-9671-71fa-8451-fde5aaeb5e98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_019e64a9-9671-7020-bda3-aa9f185b874a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_019e64a9-9671-7020-bda3-aa9f185b874a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019e64a9-9671-74de-8980-9f8354638ef1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_019e64a9-9671-74de-8980-9f8354638ef1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019e64a9-9671-73d6-a8eb-a04c6f79b1d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-7ed2-beef-14c511b05ff6" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019e64a9-9671-73d6-a8eb-a04c6f79b1d1" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019eb739-2b15-7c64-8b59-c5796ccc2a11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:to="loc_us-gaap_DebtInstrumentAxis_019eb739-2b15-7c64-8b59-c5796ccc2a11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eb739-2b15-7c64-8b59-c5796ccc2a11_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019eb739-2b15-7c64-8b59-c5796ccc2a11" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eb739-2b15-7c64-8b59-c5796ccc2a11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eb739-2b15-7a57-8c4b-a2ffacaa9a8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019eb739-2b15-7c64-8b59-c5796ccc2a11" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eb739-2b15-7a57-8c4b-a2ffacaa9a8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CreditAgreementMember_019eb739-2b15-7106-b813-2909b5d82328" xlink:href="mair-20260630.xsd#mair_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eb739-2b15-7a57-8c4b-a2ffacaa9a8f" xlink:to="loc_mair_CreditAgreementMember_019eb739-2b15-7106-b813-2909b5d82328" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_A2026IncrementalRevolvingFacilityMember_019f479e-b986-7f95-afe9-5aa65888491a" xlink:href="mair-20260630.xsd#mair_A2026IncrementalRevolvingFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eb739-2b15-7a57-8c4b-a2ffacaa9a8f" xlink:to="loc_mair_A2026IncrementalRevolvingFacilityMember_019f479e-b986-7f95-afe9-5aa65888491a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_IncrementalTermLoanMember_019f829e-bcc0-73ce-a79c-2dd88f9ebb20" xlink:href="mair-20260630.xsd#mair_IncrementalTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eb739-2b15-7a57-8c4b-a2ffacaa9a8f" xlink:to="loc_mair_IncrementalTermLoanMember_019f829e-bcc0-73ce-a79c-2dd88f9ebb20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019eb739-2b15-71a8-bdfb-0dbbdc2ebd36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019eb739-2b15-71a8-bdfb-0dbbdc2ebd36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-71a8-bdfb-0dbbdc2ebd36_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019eb739-2b15-71a8-bdfb-0dbbdc2ebd36" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-71a8-bdfb-0dbbdc2ebd36_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-74ed-a214-82b4f3eb6c59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019eb739-2b15-71a8-bdfb-0dbbdc2ebd36" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-74ed-a214-82b4f3eb6c59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019eb739-2b15-7cc4-a834-98fcc058dc14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-74ed-a214-82b4f3eb6c59" xlink:to="loc_us-gaap_LineOfCreditMember_019eb739-2b15-7cc4-a834-98fcc058dc14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019eb739-2b15-758d-8903-8a9fd75a726f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-74ed-a214-82b4f3eb6c59" xlink:to="loc_us-gaap_SeniorNotesMember_019eb739-2b15-758d-8903-8a9fd75a726f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019eb739-2b15-7760-800e-ff24928b908b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-74ed-a214-82b4f3eb6c59" xlink:to="loc_us-gaap_SecuredDebtMember_019eb739-2b15-7760-800e-ff24928b908b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019eb739-2b15-7157-a538-d963088f658e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eb739-2b15-74ed-a214-82b4f3eb6c59" xlink:to="loc_us-gaap_MortgagesMember_019eb739-2b15-7157-a538-d963088f658e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019fa140-de64-7e23-afe0-1a6f77bc09cc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019fa140-de64-7e23-afe0-1a6f77bc09cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019fa140-de64-7e23-afe0-1a6f77bc09cc_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019fa140-de64-7e23-afe0-1a6f77bc09cc" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019fa140-de64-7e23-afe0-1a6f77bc09cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019fa140-de64-7f65-8344-dd0138e196ab" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019fa140-de64-7e23-afe0-1a6f77bc09cc" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019fa140-de64-7f65-8344-dd0138e196ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_MadisonIAQLLCMember_019fa141-1c3d-700f-bf3d-8465f51ee8b1" xlink:href="mair-20260630.xsd#mair_MadisonIAQLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019fa140-de64-7f65-8344-dd0138e196ab" xlink:to="loc_mair_MadisonIAQLLCMember_019fa141-1c3d-700f-bf3d-8465f51ee8b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019ef354-ec97-7da4-ad5c-c15aebd37182" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:to="loc_us-gaap_VariableRateAxis_019ef354-ec97-7da4-ad5c-c15aebd37182" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019ef354-ec97-7da4-ad5c-c15aebd37182_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019ef354-ec97-7da4-ad5c-c15aebd37182" xlink:to="loc_us-gaap_VariableRateDomain_019ef354-ec97-7da4-ad5c-c15aebd37182_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019ef354-ec97-72c7-ba4a-c1764b5c3fcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019ef354-ec97-7da4-ad5c-c15aebd37182" xlink:to="loc_us-gaap_VariableRateDomain_019ef354-ec97-72c7-ba4a-c1764b5c3fcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019ef355-774f-7d5a-9afc-5ec7e650ff4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019ef354-ec97-72c7-ba4a-c1764b5c3fcc" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019ef355-774f-7d5a-9afc-5ec7e650ff4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019ef356-3bce-723a-86bd-e65e61deeded" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019ef354-ec97-72c7-ba4a-c1764b5c3fcc" xlink:to="loc_us-gaap_BaseRateMember_019ef356-3bce-723a-86bd-e65e61deeded" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019eb739-2b15-76cf-97fa-daf61bb3bbfb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:to="loc_us-gaap_CreditFacilityAxis_019eb739-2b15-76cf-97fa-daf61bb3bbfb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eb739-2b15-76cf-97fa-daf61bb3bbfb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019eb739-2b15-76cf-97fa-daf61bb3bbfb" xlink:to="loc_us-gaap_CreditFacilityDomain_019eb739-2b15-76cf-97fa-daf61bb3bbfb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eb739-2b15-7d0e-83dd-77e1d62d09d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019eb739-2b15-76cf-97fa-daf61bb3bbfb" xlink:to="loc_us-gaap_CreditFacilityDomain_019eb739-2b15-7d0e-83dd-77e1d62d09d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019f6bb0-9cf7-72b9-97c8-3831c6b22cf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019eb739-2b15-7d0e-83dd-77e1d62d09d2" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019f6bb0-9cf7-72b9-97c8-3831c6b22cf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019eb739-2b15-7a40-83ac-c340430d8fed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019eb739-2b15-7d0e-83dd-77e1d62d09d2" xlink:to="loc_us-gaap_LetterOfCreditMember_019eb739-2b15-7a40-83ac-c340430d8fed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TriggeringEventAxis_019f6ba7-3bf7-7633-b82a-7b3133f8eed1" xlink:href="mair-20260630.xsd#mair_TriggeringEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e64a9-9671-766b-b6c9-f60f3c5b5054" xlink:to="loc_mair_TriggeringEventAxis_019f6ba7-3bf7-7633-b82a-7b3133f8eed1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TriggeringEventDomain_019f6ba7-3bf7-7633-b82a-7b3133f8eed1_default" xlink:href="mair-20260630.xsd#mair_TriggeringEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mair_TriggeringEventAxis_019f6ba7-3bf7-7633-b82a-7b3133f8eed1" xlink:to="loc_mair_TriggeringEventDomain_019f6ba7-3bf7-7633-b82a-7b3133f8eed1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TriggeringEventDomain_019f6ba7-3bf7-7bdd-a45f-04c6c2e8b3ba" xlink:href="mair-20260630.xsd#mair_TriggeringEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mair_TriggeringEventAxis_019f6ba7-3bf7-7633-b82a-7b3133f8eed1" xlink:to="loc_mair_TriggeringEventDomain_019f6ba7-3bf7-7bdd-a45f-04c6c2e8b3ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_PossibleReductionAfterSeptember302026Member_019f6ba7-f546-7bbd-9834-a86b7691e593" xlink:href="mair-20260630.xsd#mair_PossibleReductionAfterSeptember302026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mair_TriggeringEventDomain_019f6ba7-3bf7-7bdd-a45f-04c6c2e8b3ba" xlink:to="loc_mair_PossibleReductionAfterSeptember302026Member_019f6ba7-f546-7bbd-9834-a86b7691e593" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019eb739-2b15-73c3-8b78-73b0d35a53f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_019eb739-2b15-73c3-8b78-73b0d35a53f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019eb739-2b15-7ea4-9a8e-8a297dcc4eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019eb739-2b15-7ea4-9a8e-8a297dcc4eb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eb739-2b15-7cf0-ae9b-5067788d6d9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eb739-2b15-7cf0-ae9b-5067788d6d9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet_019eb739-2b15-7310-a286-e026dfd2c393" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet_019eb739-2b15-7310-a286-e026dfd2c393" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_019fa691-c0f0-7cba-b59e-0be5a27e91c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_019fa691-c0f0-7cba-b59e-0be5a27e91c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_DebtInstrumentBasisIncreaseDecreaseInSpreadOnVariableRate_019fab8d-6650-7ca6-9752-b19f42dd0e2d" xlink:href="mair-20260630.xsd#mair_DebtInstrumentBasisIncreaseDecreaseInSpreadOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_mair_DebtInstrumentBasisIncreaseDecreaseInSpreadOnVariableRate_019fab8d-6650-7ca6-9752-b19f42dd0e2d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019eb739-2b15-7659-9824-67a8ed2085da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019eb739-2b15-7659-9824-67a8ed2085da" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019eb739-2b15-7023-96c7-f53f00666eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019eb739-2b15-7023-96c7-f53f00666eb1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019eb739-2b15-7e5a-bd85-80acb50b6b9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019eb739-2b15-7e5a-bd85-80acb50b6b9c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019eb739-2b15-7848-aedf-c1f7ccead0bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_019eb739-2b15-7848-aedf-c1f7ccead0bd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019eb739-2b15-7b86-9225-bd13d29953d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019eb739-2b15-7b86-9225-bd13d29953d9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019eb739-2b15-721c-923c-7131468460da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019eb739-2b15-721c-923c-7131468460da" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eb739-2b15-7a67-84ae-3bc958bd843a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eb739-2b15-7a67-84ae-3bc958bd843a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019eb739-2b15-79d9-a22e-ac3f88cabe46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019eb739-2b15-79d9-a22e-ac3f88cabe46" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019eb739-2b15-735f-808b-35f8b5c9df8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019eb739-2b15-735f-808b-35f8b5c9df8a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019eb739-2b15-76a0-9074-88e9ced9f689" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019eb739-2b15-76a0-9074-88e9ced9f689" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019eb739-2b15-72c0-b98c-77ceec0c7ba2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e64a9-9671-76bf-af60-3ceeaf7c9bd2" xlink:to="loc_us-gaap_LongTermDebtFairValue_019eb739-2b15-72c0-b98c-77ceec0c7ba2" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/DerivativeFinancialInstrumentsScheduleofDerivativesDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#DerivativeFinancialInstrumentsScheduleofDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/DerivativeFinancialInstrumentsScheduleofDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7328-ae44-5e70e84cc850" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e64a9-9671-750d-8e9a-53abd794f6eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7328-ae44-5e70e84cc850" xlink:to="loc_us-gaap_DerivativeTable_019e64a9-9671-750d-8e9a-53abd794f6eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7b74-b562-68248f01b9b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e64a9-9671-750d-8e9a-53abd794f6eb" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7b74-b562-68248f01b9b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7b74-b562-68248f01b9b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7b74-b562-68248f01b9b0" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7b74-b562-68248f01b9b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-737e-a3ab-b92ae8a1b27d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7b74-b562-68248f01b9b0" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-737e-a3ab-b92ae8a1b27d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e64a9-9671-78b7-991e-0aa3a039fca7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-737e-a3ab-b92ae8a1b27d" xlink:to="loc_us-gaap_InterestRateContractMember_019e64a9-9671-78b7-991e-0aa3a039fca7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-71e7-84dd-8f117a1f1e07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-737e-a3ab-b92ae8a1b27d" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-71e7-84dd-8f117a1f1e07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019e64a9-9671-7800-946b-883c4bb3ff5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7328-ae44-5e70e84cc850" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019e64a9-9671-7800-946b-883c4bb3ff5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e64a9-9671-78ea-a626-6aa26b057bca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7328-ae44-5e70e84cc850" xlink:to="loc_us-gaap_DerivativeAssets_019e64a9-9671-78ea-a626-6aa26b057bca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019e64a9-9671-7fc3-8dec-b747ccb555e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7328-ae44-5e70e84cc850" xlink:to="loc_us-gaap_DerivativeLiabilities_019e64a9-9671-7fc3-8dec-b747ccb555e4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#DerivativeFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e64a9-9671-72b1-a6ed-eefce8370a5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_us-gaap_DerivativeTable_019e64a9-9671-72b1-a6ed-eefce8370a5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7647-8f42-7fa3e06d49eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e64a9-9671-72b1-a6ed-eefce8370a5a" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7647-8f42-7fa3e06d49eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7647-8f42-7fa3e06d49eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7647-8f42-7fa3e06d49eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7647-8f42-7fa3e06d49eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-771e-b012-5c4faef2172d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7647-8f42-7fa3e06d49eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-771e-b012-5c4faef2172d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e64a9-9671-7d44-83ed-778130de40d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-771e-b012-5c4faef2172d" xlink:to="loc_us-gaap_InterestRateContractMember_019e64a9-9671-7d44-83ed-778130de40d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-7fbd-bdde-780552526e3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-771e-b012-5c4faef2172d" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-7fbd-bdde-780552526e3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_DerivativeNotionalAmountTerminated_019ef361-2f7b-78f3-a22c-92548073a555" xlink:href="mair-20260630.xsd#mair_DerivativeNotionalAmountTerminated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_mair_DerivativeNotionalAmountTerminated_019ef361-2f7b-78f3-a22c-92548073a555" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ef366-bff4-7653-a10a-35d1c59a60d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ef366-bff4-7653-a10a-35d1c59a60d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CashFlowHedgeGainLossToBeReclassifiedYearOne_019e64a9-9671-73ad-a1f3-dc47dec4dad4" xlink:href="mair-20260630.xsd#mair_CashFlowHedgeGainLossToBeReclassifiedYearOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_mair_CashFlowHedgeGainLossToBeReclassifiedYearOne_019e64a9-9671-73ad-a1f3-dc47dec4dad4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CashFlowHedgeGainLossToBeReclassifiedYearTwo_019e64a9-9671-7fb3-8e5c-21ead346e69f" xlink:href="mair-20260630.xsd#mair_CashFlowHedgeGainLossToBeReclassifiedYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_mair_CashFlowHedgeGainLossToBeReclassifiedYearTwo_019e64a9-9671-7fb3-8e5c-21ead346e69f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_019e64a9-9671-781f-93f6-6b2852b2da4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_us-gaap_DerivativeAssetsCurrent_019e64a9-9671-781f-93f6-6b2852b2da4c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_019e64a9-9671-7b05-9b2f-448b0dca71db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_019e64a9-9671-7b05-9b2f-448b0dca71db" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesCurrent_019e64a9-9671-7117-afa3-4c5b1f5e3751" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_us-gaap_DerivativeLiabilitiesCurrent_019e64a9-9671-7117-afa3-4c5b1f5e3751" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_019e64a9-9671-7968-b8df-2490e700b8b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e64a9-9671-7728-9165-9334f09e8362" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_019e64a9-9671-7968-b8df-2490e700b8b8" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/DerivativeFinancialInstrumentsEffectofDerivativesonComprehensiveIncomeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#DerivativeFinancialInstrumentsEffectofDerivativesonComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/DerivativeFinancialInstrumentsEffectofDerivativesonComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e64a9-9671-7900-97be-ae61d57e0a09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e64a9-9671-7307-96c5-4b3901c0a5e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e64a9-9671-7900-97be-ae61d57e0a09" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e64a9-9671-7307-96c5-4b3901c0a5e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7cd8-8948-01113770ceb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e64a9-9671-7307-96c5-4b3901c0a5e2" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7cd8-8948-01113770ceb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7cd8-8948-01113770ceb3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7cd8-8948-01113770ceb3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7cd8-8948-01113770ceb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7f2f-97bb-13fcd2118cf7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e64a9-9671-7cd8-8948-01113770ceb3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7f2f-97bb-13fcd2118cf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e64a9-9671-787e-981f-c56904ff5439" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7f2f-97bb-13fcd2118cf7" xlink:to="loc_us-gaap_InterestRateContractMember_019e64a9-9671-787e-981f-c56904ff5439" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-7432-817c-eda17c7448f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e64a9-9671-7f2f-97bb-13fcd2118cf7" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e64a9-9671-7432-817c-eda17c7448f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019e64a9-9671-70aa-a9c3-256a6a7c3fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e64a9-9671-7900-97be-ae61d57e0a09" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019e64a9-9671-70aa-a9c3-256a6a7c3fd9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_019e64a9-9671-7416-ab2b-d1c82f71ad9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e64a9-9671-7900-97be-ae61d57e0a09" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_019e64a9-9671-7416-ab2b-d1c82f71ad9f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019e64a9-9671-75eb-82a1-f5a203cd55fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019e64a9-9671-75eb-82a1-f5a203cd55fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-77d6-9934-388f2edeb194" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019e64a9-9671-75eb-82a1-f5a203cd55fb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-77d6-9934-388f2edeb194" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-77d6-9934-388f2edeb194_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-77d6-9934-388f2edeb194" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-77d6-9934-388f2edeb194_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-7e21-a9ad-fc0eaf74b7f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e64a9-9671-77d6-9934-388f2edeb194" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-7e21-a9ad-fc0eaf74b7f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_019e64a9-9671-743a-aca3-77524598cbcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e64a9-9671-7e21-a9ad-fc0eaf74b7f3" xlink:to="loc_us-gaap_BuildingMember_019e64a9-9671-743a-aca3-77524598cbcc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019e64a9-9671-762f-aa92-42c76b3c5caf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019e64a9-9671-762f-aa92-42c76b3c5caf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019e64a9-9671-7e6b-9aa9-3dd8392641a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019e64a9-9671-7e6b-9aa9-3dd8392641a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_019e64a9-9671-764d-91dc-96acf5f38f69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_019e64a9-9671-764d-91dc-96acf5f38f69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_019e64a9-9671-74ed-a3f3-33b1495d2857" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_019e64a9-9671-74ed-a3f3-33b1495d2857" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019e64a9-9671-7ae3-9370-9fd5dd2f9348" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_019e64a9-9671-7ae3-9370-9fd5dd2f9348" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_LesseeOperatingLeaseNumberOfExtensions_019e64a9-9671-765a-9672-d8f46ba65446" xlink:href="mair-20260630.xsd#mair_LesseeOperatingLeaseNumberOfExtensions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_mair_LesseeOperatingLeaseNumberOfExtensions_019e64a9-9671-765a-9672-d8f46ba65446" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_019e64a9-9671-7cbd-b001-d0e74bdcecb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_019e64a9-9671-7cbd-b001-d0e74bdcecb7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019e64a9-9671-709a-986c-5ff6105be20d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_019e64a9-9671-709a-986c-5ff6105be20d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019e64a9-9671-7536-a2fc-05fda03f4c29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019e64a9-9671-7536-a2fc-05fda03f4c29" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019e64a9-9671-78d6-9102-17c2ea51e698" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019e64a9-9671-76e0-88fa-464a72955110" xlink:to="loc_us-gaap_OperatingLeaseLiability_019e64a9-9671-78d6-9102-17c2ea51e698" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/EmployeeBenefitPlansNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#EmployeeBenefitPlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/EmployeeBenefitPlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019f800e-ff92-7db0-b0aa-cd0ea01b3d33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019f800e-ff92-7919-9853-fde178b5298a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019f800e-ff92-7db0-b0aa-cd0ea01b3d33" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019f800e-ff92-7919-9853-fde178b5298a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019f800e-ff92-7d74-bbe7-7f9750f8b3d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019f800e-ff92-7919-9853-fde178b5298a" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019f800e-ff92-7d74-bbe7-7f9750f8b3d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019f800e-ff92-7d74-bbe7-7f9750f8b3d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019f800e-ff92-7d74-bbe7-7f9750f8b3d9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019f800e-ff92-7d74-bbe7-7f9750f8b3d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019f800e-ff92-7026-a1f0-599b87a2be1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019f800e-ff92-7d74-bbe7-7f9750f8b3d9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019f800e-ff92-7026-a1f0-599b87a2be1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019f800e-ff92-72f5-8dcb-3338032d9fe7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019f800e-ff92-7026-a1f0-599b87a2be1c" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019f800e-ff92-72f5-8dcb-3338032d9fe7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019f800e-ff92-7f16-9964-3a693fbd0c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019f800e-ff92-7919-9853-fde178b5298a" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019f800e-ff92-7f16-9964-3a693fbd0c0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019f800e-ff92-7f16-9964-3a693fbd0c0c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019f800e-ff92-7f16-9964-3a693fbd0c0c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019f800e-ff92-7f16-9964-3a693fbd0c0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019f800e-ff92-7bda-82d5-b70d5267b566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019f800e-ff92-7f16-9964-3a693fbd0c0c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019f800e-ff92-7bda-82d5-b70d5267b566" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019fa41a-ab6c-7eb5-80ea-95285221cdb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019f800e-ff92-7bda-82d5-b70d5267b566" xlink:to="loc_us-gaap_DomesticPlanMember_019fa41a-ab6c-7eb5-80ea-95285221cdb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019f800e-ff92-73d3-8d1c-34a44383ffac" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019fa41a-ab6c-7eb5-80ea-95285221cdb3" xlink:to="loc_country_US_019f800e-ff92-73d3-8d1c-34a44383ffac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_019e64a9-9671-7781-894d-5c96547d82eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019f800e-ff92-7db0-b0aa-cd0ea01b3d33" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_019e64a9-9671-7781-894d-5c96547d82eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_019f4c56-8c3e-730b-b866-219b99ed9908" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019f800e-ff92-7db0-b0aa-cd0ea01b3d33" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_019f4c56-8c3e-730b-b866-219b99ed9908" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_DefinedBenefitPlanBenefitObligationAmountConvertedIntoCash_019f6ba1-b8b8-7c46-a863-87ff5b9e3be8" xlink:href="mair-20260630.xsd#mair_DefinedBenefitPlanBenefitObligationAmountConvertedIntoCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019f800e-ff92-7db0-b0aa-cd0ea01b3d33" xlink:to="loc_mair_DefinedBenefitPlanBenefitObligationAmountConvertedIntoCash_019f6ba1-b8b8-7c46-a863-87ff5b9e3be8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/EmployeeBenefitPlansDiscretionaryContributionsDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#EmployeeBenefitPlansDiscretionaryContributionsDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/EmployeeBenefitPlansDiscretionaryContributionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019ebc16-df24-7baa-8f04-15209554699f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019ebc16-df24-742d-a9d5-fdf853ac24eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019ebc16-df24-7baa-8f04-15209554699f" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019ebc16-df24-742d-a9d5-fdf853ac24eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019f8011-802c-7124-8146-2b7a1c3f9753" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019ebc16-df24-742d-a9d5-fdf853ac24eb" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019f8011-802c-7124-8146-2b7a1c3f9753" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019f8011-802c-7124-8146-2b7a1c3f9753_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019f8011-802c-7124-8146-2b7a1c3f9753" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019f8011-802c-7124-8146-2b7a1c3f9753_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019f8011-802c-783c-9f45-fdf6013a37ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019f8011-802c-7124-8146-2b7a1c3f9753" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019f8011-802c-783c-9f45-fdf6013a37ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019f8011-802c-75db-b2f3-e2c77be7013b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019f8011-802c-783c-9f45-fdf6013a37ce" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019f8011-802c-75db-b2f3-e2c77be7013b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019ebc16-df24-7f02-92e4-e67ba0d548fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019ebc16-df24-742d-a9d5-fdf853ac24eb" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019ebc16-df24-7f02-92e4-e67ba0d548fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019ebc16-df24-7f02-92e4-e67ba0d548fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019ebc16-df24-7f02-92e4-e67ba0d548fd" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019ebc16-df24-7f02-92e4-e67ba0d548fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019ebc16-df24-78c4-9788-2144b6e1a46e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019ebc16-df24-7f02-92e4-e67ba0d548fd" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019ebc16-df24-78c4-9788-2144b6e1a46e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019fa41a-eb0b-7511-bb10-2eb6d8760640" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019ebc16-df24-78c4-9788-2144b6e1a46e" xlink:to="loc_us-gaap_DomesticPlanMember_019fa41a-eb0b-7511-bb10-2eb6d8760640" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019ebc16-df24-7a74-a339-6ab718165ddb" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019fa41a-eb0b-7511-bb10-2eb6d8760640" xlink:to="loc_country_US_019ebc16-df24-7a74-a339-6ab718165ddb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_019ebc16-df24-71dd-85f2-a0e284bfb9c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019ebc16-df24-78c4-9788-2144b6e1a46e" xlink:to="loc_us-gaap_ForeignPlanMember_019ebc16-df24-71dd-85f2-a0e284bfb9c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_019ebc16-df24-7be7-80b4-e54d00cdce20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019ebc16-df24-7baa-8f04-15209554699f" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_019ebc16-df24-7be7-80b4-e54d00cdce20" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/EmployeeBenefitPlansComponentsofNetPeriodicPensionExpenseBenefitDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#EmployeeBenefitPlansComponentsofNetPeriodicPensionExpenseBenefitDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/EmployeeBenefitPlansComponentsofNetPeriodicPensionExpenseBenefitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e64a9-9671-7389-b0c9-5e7c737d79e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e64a9-9671-7200-a1a4-5835b6a3e9c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e64a9-9671-7389-b0c9-5e7c737d79e6" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e64a9-9671-7200-a1a4-5835b6a3e9c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e64a9-9671-7cac-b6f2-a6aa5ba0288c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e64a9-9671-7200-a1a4-5835b6a3e9c9" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e64a9-9671-7cac-b6f2-a6aa5ba0288c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e64a9-9671-7cac-b6f2-a6aa5ba0288c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e64a9-9671-7cac-b6f2-a6aa5ba0288c" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e64a9-9671-7cac-b6f2-a6aa5ba0288c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e64a9-9671-7826-a1d4-b14b125c76a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e64a9-9671-7cac-b6f2-a6aa5ba0288c" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e64a9-9671-7826-a1d4-b14b125c76a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e64a9-9671-7c04-bdf5-0e7986e3664d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e64a9-9671-7826-a1d4-b14b125c76a9" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e64a9-9671-7c04-bdf5-0e7986e3664d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e64a9-9671-7b80-afba-d7db4c2c0174" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e64a9-9671-7200-a1a4-5835b6a3e9c9" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e64a9-9671-7b80-afba-d7db4c2c0174" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e64a9-9671-7b80-afba-d7db4c2c0174_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e64a9-9671-7b80-afba-d7db4c2c0174" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e64a9-9671-7b80-afba-d7db4c2c0174_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e64a9-9671-76d9-8e5c-6be4dc6b36be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e64a9-9671-7b80-afba-d7db4c2c0174" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e64a9-9671-76d9-8e5c-6be4dc6b36be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019e64a9-9671-7b15-b57e-2aeb2ea223ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e64a9-9671-76d9-8e5c-6be4dc6b36be" xlink:to="loc_us-gaap_DomesticPlanMember_019e64a9-9671-7b15-b57e-2aeb2ea223ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e64a9-9671-7e97-a518-30b8eb2a3dbb" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019e64a9-9671-7b15-b57e-2aeb2ea223ad" xlink:to="loc_country_US_019e64a9-9671-7e97-a518-30b8eb2a3dbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_019e64a9-9671-7c3b-999e-27af8f6df57e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e64a9-9671-76d9-8e5c-6be4dc6b36be" xlink:to="loc_us-gaap_ForeignPlanMember_019e64a9-9671-7c3b-999e-27af8f6df57e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_019e64a9-9671-7bf3-8eb3-c21dec983568" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e64a9-9671-7389-b0c9-5e7c737d79e6" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_019e64a9-9671-7bf3-8eb3-c21dec983568" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_019e64a9-9671-75c0-967d-401ab8dff441" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e64a9-9671-7389-b0c9-5e7c737d79e6" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_019e64a9-9671-75c0-967d-401ab8dff441" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019e64a9-9671-73a6-9ec3-64c0adc2aeb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e64a9-9671-7389-b0c9-5e7c737d79e6" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019e64a9-9671-73a6-9ec3-64c0adc2aeb4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019e64a9-9671-7ae3-8026-b22058d68d1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e64a9-9671-7389-b0c9-5e7c737d79e6" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019e64a9-9671-7ae3-8026-b22058d68d1f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/EquityAppreciationRightsNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#EquityAppreciationRightsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/EquityAppreciationRightsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e64a9-9671-7fee-ad9b-4a868d9cce60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e64a9-9671-7fee-ad9b-4a868d9cce60" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019eb754-0754-70a9-b64e-10d6fa4cffaa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e64a9-9671-7fee-ad9b-4a868d9cce60" xlink:to="loc_us-gaap_PlanNameAxis_019eb754-0754-70a9-b64e-10d6fa4cffaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019eb754-0754-70a9-b64e-10d6fa4cffaa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019eb754-0754-70a9-b64e-10d6fa4cffaa" xlink:to="loc_us-gaap_PlanNameDomain_019eb754-0754-70a9-b64e-10d6fa4cffaa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019eb754-0754-7dff-b861-40ee86d52060" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019eb754-0754-70a9-b64e-10d6fa4cffaa" xlink:to="loc_us-gaap_PlanNameDomain_019eb754-0754-7dff-b861-40ee86d52060" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_EARPlanMember_019eb754-0754-7052-840c-43ecf3cc7263" xlink:href="mair-20260630.xsd#mair_EARPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019eb754-0754-7dff-b861-40ee86d52060" xlink:to="loc_mair_EARPlanMember_019eb754-0754-7052-840c-43ecf3cc7263" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e64a9-9671-772d-919b-9a66262886d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e64a9-9671-772d-919b-9a66262886d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_ShareBasedCompensationArrangementByShareBasedPaymentAwardModificationConversionRatio_019eb754-0754-72d0-8a60-26aa12b0a29a" xlink:href="mair-20260630.xsd#mair_ShareBasedCompensationArrangementByShareBasedPaymentAwardModificationConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_mair_ShareBasedCompensationArrangementByShareBasedPaymentAwardModificationConversionRatio_019eb754-0754-72d0-8a60-26aa12b0a29a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019eb74f-ddd9-715d-98e2-c13c7101c54a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019eb74f-ddd9-715d-98e2-c13c7101c54a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019eb752-3898-756b-814c-c3dc970376f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019eb752-3898-756b-814c-c3dc970376f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019eb759-57c9-77de-82b6-f37485288d26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019eb759-57c9-77de-82b6-f37485288d26" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019eb75c-a9df-790a-9216-89af1904cde9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019eb75c-a9df-790a-9216-89af1904cde9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019f4bde-4496-74d9-b769-86604c88aea5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019f4bde-4496-74d9-b769-86604c88aea5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019f4bde-f324-7561-af6e-d03054a5a40f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019f4bde-f324-7561-af6e-d03054a5a40f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019f4be1-8c0b-7c4a-8730-e25e693e7de4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019f4be1-8c0b-7c4a-8730-e25e693e7de4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019f4be2-7c8a-7826-b0be-8bd8c6e2de55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-7bb4-8d74-0eef058497f8" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019f4be2-7c8a-7826-b0be-8bd8c6e2de55" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/EquityAppreciationRightsStockbasedcompensationcostbyawardtypeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#EquityAppreciationRightsStockbasedcompensationcostbyawardtypeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/EquityAppreciationRightsStockbasedcompensationcostbyawardtypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-72f3-b204-77bddc8ca0bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e64a9-9671-7da7-8d2f-5df0b1dd3d43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-72f3-b204-77bddc8ca0bb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e64a9-9671-7da7-8d2f-5df0b1dd3d43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019e64a9-9671-7438-8d77-244243c358c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e64a9-9671-7da7-8d2f-5df0b1dd3d43" xlink:to="loc_us-gaap_PlanNameAxis_019e64a9-9671-7438-8d77-244243c358c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019e64a9-9671-7438-8d77-244243c358c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019e64a9-9671-7438-8d77-244243c358c5" xlink:to="loc_us-gaap_PlanNameDomain_019e64a9-9671-7438-8d77-244243c358c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019e64a9-9671-78e7-a485-7a88137c6d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019e64a9-9671-7438-8d77-244243c358c5" xlink:to="loc_us-gaap_PlanNameDomain_019e64a9-9671-78e7-a485-7a88137c6d9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_EARPlanMember_019e64a9-9671-7a06-87ad-95b7020d5250" xlink:href="mair-20260630.xsd#mair_EARPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019e64a9-9671-78e7-a485-7a88137c6d9f" xlink:to="loc_mair_EARPlanMember_019e64a9-9671-7a06-87ad-95b7020d5250" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AmendedEARPlanMember_019e64a9-9671-7e5d-bbf7-c3c5c5d3eff7" xlink:href="mair-20260630.xsd#mair_AmendedEARPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019e64a9-9671-78e7-a485-7a88137c6d9f" xlink:to="loc_mair_AmendedEARPlanMember_019e64a9-9671-7e5d-bbf7-c3c5c5d3eff7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e64a9-9671-77e0-ab93-2b6499c76c88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e64a9-9671-72f3-b204-77bddc8ca0bb" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e64a9-9671-77e0-ab93-2b6499c76c88" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019e64a9-9671-7a57-b7c9-048885424c2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e64a9-9671-71bc-b486-2e531f85cc05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e64a9-9671-7a57-b7c9-048885424c2a" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e64a9-9671-71bc-b486-2e531f85cc05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e64a9-9671-7c96-b212-2cd8cedbd777" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e64a9-9671-71bc-b486-2e531f85cc05" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e64a9-9671-7c96-b212-2cd8cedbd777" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e64a9-9671-7c96-b212-2cd8cedbd777_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e64a9-9671-7c96-b212-2cd8cedbd777" xlink:to="loc_us-gaap_RelatedPartyDomain_019e64a9-9671-7c96-b212-2cd8cedbd777_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e64a9-9671-736a-9f7e-1ce185d6e566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e64a9-9671-7c96-b212-2cd8cedbd777" xlink:to="loc_us-gaap_RelatedPartyDomain_019e64a9-9671-736a-9f7e-1ce185d6e566" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019e64a9-9671-78d1-a51c-3d71e2ea3571" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e64a9-9671-736a-9f7e-1ce185d6e566" xlink:to="loc_us-gaap_RelatedPartyMember_019e64a9-9671-78d1-a51c-3d71e2ea3571" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019f9271-e7a1-77ce-abf7-8bae6ae0c66e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e64a9-9671-71bc-b486-2e531f85cc05" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019f9271-e7a1-77ce-abf7-8bae6ae0c66e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019f9271-e7a1-77ce-abf7-8bae6ae0c66e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019f9271-e7a1-77ce-abf7-8bae6ae0c66e" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019f9271-e7a1-77ce-abf7-8bae6ae0c66e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019f9271-e7a1-705d-81d7-a012c41a1336" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019f9271-e7a1-77ce-abf7-8bae6ae0c66e" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019f9271-e7a1-705d-81d7-a012c41a1336" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_SupportFromHoldingsMember_019f95cc-3e2b-77cf-9703-32aebffed5d3" xlink:href="mair-20260630.xsd#mair_SupportFromHoldingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019f9271-e7a1-705d-81d7-a012c41a1336" xlink:to="loc_mair_SupportFromHoldingsMember_019f95cc-3e2b-77cf-9703-32aebffed5d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TransitionServiceAgreementMember_019f9272-84ec-7a55-b6a7-3ad400e6b948" xlink:href="mair-20260630.xsd#mair_TransitionServiceAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019f9271-e7a1-705d-81d7-a012c41a1336" xlink:to="loc_mair_TransitionServiceAgreementMember_019f9272-84ec-7a55-b6a7-3ad400e6b948" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e64a9-9671-7c8b-8079-99cc4fcdaa94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e64a9-9671-7a57-b7c9-048885424c2a" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e64a9-9671-7c8b-8079-99cc4fcdaa94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019f82ca-e721-7de5-ae47-c2c08cc0655a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e64a9-9671-7a57-b7c9-048885424c2a" xlink:to="loc_us-gaap_AccountsPayableCurrent_019f82ca-e721-7de5-ae47-c2c08cc0655a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/ProductWarrantiesNarrativeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#ProductWarrantiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/ProductWarrantiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyLiabilityLineItems_019e64a9-9672-7e94-af37-8ae3b8b389b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductWarrantyLiabilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyLiabilityTable_019e64a9-9672-7aba-9eab-f81cf3aff769" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductWarrantyLiabilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ProductWarrantyLiabilityLineItems_019e64a9-9672-7e94-af37-8ae3b8b389b6" xlink:to="loc_us-gaap_ProductWarrantyLiabilityTable_019e64a9-9672-7aba-9eab-f81cf3aff769" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e64a9-9672-735b-8c89-30b9964342ea" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ProductWarrantyLiabilityTable_019e64a9-9672-7aba-9eab-f81cf3aff769" xlink:to="loc_srt_RangeAxis_019e64a9-9672-735b-8c89-30b9964342ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e64a9-9672-735b-8c89-30b9964342ea_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e64a9-9672-735b-8c89-30b9964342ea" xlink:to="loc_srt_RangeMember_019e64a9-9672-735b-8c89-30b9964342ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e64a9-9672-7de6-a9b2-c80aa6d31b99" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e64a9-9672-735b-8c89-30b9964342ea" xlink:to="loc_srt_RangeMember_019e64a9-9672-7de6-a9b2-c80aa6d31b99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e64a9-9672-7a9b-95dc-fe4d2f4b7bb6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e64a9-9672-7de6-a9b2-c80aa6d31b99" xlink:to="loc_srt_MinimumMember_019e64a9-9672-7a9b-95dc-fe4d2f4b7bb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e64a9-9672-786e-b229-4381d3ccd78d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e64a9-9672-7de6-a9b2-c80aa6d31b99" xlink:to="loc_srt_MaximumMember_019e64a9-9672-786e-b229-4381d3ccd78d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualCurrent_019e64a9-9672-7faf-9e26-4325ed951225" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StandardProductWarrantyAccrualCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductWarrantyLiabilityLineItems_019e64a9-9672-7e94-af37-8ae3b8b389b6" xlink:to="loc_us-gaap_StandardProductWarrantyAccrualCurrent_019e64a9-9672-7faf-9e26-4325ed951225" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualNoncurrent_019e64a9-9672-798f-80ae-be39b6f65ed2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StandardProductWarrantyAccrualNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductWarrantyLiabilityLineItems_019e64a9-9672-7e94-af37-8ae3b8b389b6" xlink:to="loc_us-gaap_StandardProductWarrantyAccrualNoncurrent_019e64a9-9672-798f-80ae-be39b6f65ed2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyObligationTerm_019e64a9-9672-79af-a995-50462edfb2a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductWarrantyObligationTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductWarrantyLiabilityLineItems_019e64a9-9672-7e94-af37-8ae3b8b389b6" xlink:to="loc_us-gaap_ProductWarrantyObligationTerm_019e64a9-9672-79af-a995-50462edfb2a9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#AccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e64a9-9672-77df-9428-ecdfb3c87b73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e64a9-9672-7f68-899c-00f316c49049" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e64a9-9672-77df-9428-ecdfb3c87b73" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e64a9-9672-7f68-899c-00f316c49049" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-9672-7841-9d91-4ed11f40708b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e64a9-9672-7f68-899c-00f316c49049" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-9672-7841-9d91-4ed11f40708b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e64a9-9672-7841-9d91-4ed11f40708b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-9672-7841-9d91-4ed11f40708b" xlink:to="loc_us-gaap_EquityComponentDomain_019e64a9-9672-7841-9d91-4ed11f40708b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e64a9-9672-7e13-974e-018519c199fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e64a9-9672-7841-9d91-4ed11f40708b" xlink:to="loc_us-gaap_EquityComponentDomain_019e64a9-9672-7e13-974e-018519c199fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-9672-7390-b2b5-3ac03cff31f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e64a9-9672-7e13-974e-018519c199fb" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-9672-7390-b2b5-3ac03cff31f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e64a9-9672-70dc-bc51-4c99734b8943" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-9672-7390-b2b5-3ac03cff31f6" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e64a9-9672-70dc-bc51-4c99734b8943" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e64a9-9672-7512-9a15-eb4b4f5394f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-9672-7390-b2b5-3ac03cff31f6" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e64a9-9672-7512-9a15-eb4b4f5394f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019e64a9-9672-7993-a01d-8ce859512292" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-9672-7390-b2b5-3ac03cff31f6" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019e64a9-9672-7993-a01d-8ce859512292" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e64a9-9672-73da-85f5-15dacdc71309" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e64a9-9672-7390-b2b5-3ac03cff31f6" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e64a9-9672-73da-85f5-15dacdc71309" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TriggeringEventAxis_019e64a9-9672-7f5a-8ed0-10d0a4bf8889" xlink:href="mair-20260630.xsd#mair_TriggeringEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e64a9-9672-7f68-899c-00f316c49049" xlink:to="loc_mair_TriggeringEventAxis_019e64a9-9672-7f5a-8ed0-10d0a4bf8889" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TriggeringEventDomain_019e64a9-9672-7f5a-8ed0-10d0a4bf8889_default" xlink:href="mair-20260630.xsd#mair_TriggeringEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mair_TriggeringEventAxis_019e64a9-9672-7f5a-8ed0-10d0a4bf8889" xlink:to="loc_mair_TriggeringEventDomain_019e64a9-9672-7f5a-8ed0-10d0a4bf8889_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TriggeringEventDomain_019e64a9-9672-719d-a399-f8c53b29c492" xlink:href="mair-20260630.xsd#mair_TriggeringEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mair_TriggeringEventAxis_019e64a9-9672-7f5a-8ed0-10d0a4bf8889" xlink:to="loc_mair_TriggeringEventDomain_019e64a9-9672-719d-a399-f8c53b29c492" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_IncludingTaxDistributionToParentMember_019e64a9-9672-7299-bdb2-ba139cfd041f" xlink:href="mair-20260630.xsd#mair_IncludingTaxDistributionToParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mair_TriggeringEventDomain_019e64a9-9672-719d-a399-f8c53b29c492" xlink:to="loc_mair_IncludingTaxDistributionToParentMember_019e64a9-9672-7299-bdb2-ba139cfd041f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e64a9-9672-7cc4-8655-acffb0ec040b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e64a9-9672-77df-9428-ecdfb3c87b73" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e64a9-9672-7cc4-8655-acffb0ec040b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-9672-7bec-b794-be70c6e2796b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e64a9-9672-7cc4-8655-acffb0ec040b" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-9672-7bec-b794-be70c6e2796b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e64a9-9672-79fd-be7e-b505a9e01b14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e64a9-9672-7cc4-8655-acffb0ec040b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e64a9-9672-79fd-be7e-b505a9e01b14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e64a9-9672-7086-a6be-b7ed87627b6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e64a9-9672-7cc4-8655-acffb0ec040b" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e64a9-9672-7086-a6be-b7ed87627b6d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019e64a9-9672-7955-8658-164dfbaa388c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e64a9-9672-7086-a6be-b7ed87627b6d" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019e64a9-9672-7955-8658-164dfbaa388c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_OtherComprehensiveIncomeLossExchangeOfNoncontrollingInterestForClassACommonStock_019f82de-be97-7df2-a9cc-1b559c110345" xlink:href="mair-20260630.xsd#mair_OtherComprehensiveIncomeLossExchangeOfNoncontrollingInterestForClassACommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e64a9-9672-7086-a6be-b7ed87627b6d" xlink:to="loc_mair_OtherComprehensiveIncomeLossExchangeOfNoncontrollingInterestForClassACommonStock_019f82de-be97-7df2-a9cc-1b559c110345" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e64a9-9672-7b7b-816b-5b64fb3f0f81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e64a9-9672-7086-a6be-b7ed87627b6d" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e64a9-9672-7b7b-816b-5b64fb3f0f81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e64a9-9672-7877-a426-684e2c4b5d68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e64a9-9672-7cc4-8655-acffb0ec040b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e64a9-9672-7877-a426-684e2c4b5d68" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e64a9-9672-76bf-a2ae-8f2f53a113cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/SegmentInformationSegmentResultsDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#SegmentInformationSegmentResultsDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/SegmentInformationSegmentResultsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_019e64a9-9672-72d8-86a5-50768a1e5a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_019e64a9-9672-72d8-86a5-50768a1e5a6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e64a9-9672-7792-9796-7a0aa2edb5f4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_019e64a9-9672-72d8-86a5-50768a1e5a6e" xlink:to="loc_srt_ConsolidationItemsAxis_019e64a9-9672-7792-9796-7a0aa2edb5f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e64a9-9672-7792-9796-7a0aa2edb5f4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e64a9-9672-7792-9796-7a0aa2edb5f4" xlink:to="loc_srt_ConsolidationItemsDomain_019e64a9-9672-7792-9796-7a0aa2edb5f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e64a9-9672-7379-a24a-abf207da0d96" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e64a9-9672-7792-9796-7a0aa2edb5f4" xlink:to="loc_srt_ConsolidationItemsDomain_019e64a9-9672-7379-a24a-abf207da0d96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e64a9-9672-749f-a181-1a79d8a96542" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e64a9-9672-7379-a24a-abf207da0d96" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e64a9-9672-749f-a181-1a79d8a96542" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019e64a9-9672-7b62-b562-7c2fd24f4943" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e64a9-9672-7379-a24a-abf207da0d96" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019e64a9-9672-7b62-b562-7c2fd24f4943" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9672-7094-8f35-fe89e8d92c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_019e64a9-9672-72d8-86a5-50768a1e5a6e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9672-7094-8f35-fe89e8d92c0f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e64a9-9672-7094-8f35-fe89e8d92c0f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9672-7094-8f35-fe89e8d92c0f" xlink:to="loc_us-gaap_SegmentDomain_019e64a9-9672-7094-8f35-fe89e8d92c0f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e64a9-9672-787b-a0d7-9e5d60d7c936" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e64a9-9672-7094-8f35-fe89e8d92c0f" xlink:to="loc_us-gaap_SegmentDomain_019e64a9-9672-787b-a0d7-9e5d60d7c936" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CommercialSegmentMember_019e64a9-9672-7ac8-85e1-fe42585f2921" xlink:href="mair-20260630.xsd#mair_CommercialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e64a9-9672-787b-a0d7-9e5d60d7c936" xlink:to="loc_mair_CommercialSegmentMember_019e64a9-9672-7ac8-85e1-fe42585f2921" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_ResidentialSegmentMember_019e64a9-9672-70a6-ad2d-ae5bcca7e01a" xlink:href="mair-20260630.xsd#mair_ResidentialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e64a9-9672-787b-a0d7-9e5d60d7c936" xlink:to="loc_mair_ResidentialSegmentMember_019e64a9-9672-70a6-ad2d-ae5bcca7e01a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e64a9-9672-7a57-adbc-d4d8a691a519" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e64a9-9672-7a57-adbc-d4d8a691a519" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_019e64a9-9672-76a2-9d2c-51f04d5ee344" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_CostOfRevenue_019e64a9-9672-76a2-9d2c-51f04d5ee344" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e64a9-9672-7cf0-81ff-1029ceb57e2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e64a9-9672-7cf0-81ff-1029ceb57e2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacks_019e64a9-9672-7e23-bfc7-1b4d8c4b11a3" xlink:href="mair-20260630.xsd#mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacks_019e64a9-9672-7e23-bfc7-1b4d8c4b11a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortization_019e64a9-9672-7bc7-9384-acd5584bf469" xlink:href="mair-20260630.xsd#mair_EarningsBeforeInterestTaxDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortization_019e64a9-9672-7bc7-9384-acd5584bf469" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_CentralAndOtherCosts_019e64a9-9672-74f6-8dde-5dc78857167e" xlink:href="mair-20260630.xsd#mair_CentralAndOtherCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_mair_CentralAndOtherCosts_019e64a9-9672-74f6-8dde-5dc78857167e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AllocatedIndustriesCosts_019e64a9-9672-705e-adae-100b03304e4d" xlink:href="mair-20260630.xsd#mair_AllocatedIndustriesCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_mair_AllocatedIndustriesCosts_019e64a9-9672-705e-adae-100b03304e4d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacksExcludingDepreciation_019e64a9-9672-735f-bec2-cfe30b39e7d2" xlink:href="mair-20260630.xsd#mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacksExcludingDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacksExcludingDepreciation_019e64a9-9672-735f-bec2-cfe30b39e7d2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019e64a9-9672-7e0e-b4fd-f6c8724634a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_Depreciation_019e64a9-9672-7e0e-b4fd-f6c8724634a3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e64a9-9672-7a20-8a2e-df89ffd8b522" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e64a9-9672-7a20-8a2e-df89ffd8b522" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e64a9-9672-76fb-82a0-3fc658f3d1a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_RestructuringCharges_019e64a9-9672-76fb-82a0-3fc658f3d1a3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e64a9-9672-769f-94b8-ef4eff156e8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019e64a9-9672-769f-94b8-ef4eff156e8f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_TransactionExpenses_019e64a9-9672-78ad-9e3b-31e28985ad39" xlink:href="mair-20260630.xsd#mair_TransactionExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_mair_TransactionExpenses_019e64a9-9672-78ad-9e3b-31e28985ad39" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDebtExpense_019e64a9-9672-75d6-8475-07ebf60b3a4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDebtExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_InterestAndDebtExpense_019e64a9-9672-75d6-8475-07ebf60b3a4f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019e64a9-9672-7119-99ff-d6565ed31048" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019e64a9-9672-7119-99ff-d6565ed31048" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e64a9-9672-7f1a-9a6d-082fc4b00565" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e64a9-9672-7f1a-9a6d-082fc4b00565" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacksAdjustments_019ef38a-eea7-7c38-8ba9-880495371e96" xlink:href="mair-20260630.xsd#mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacksAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_mair_EarningsBeforeInterestTaxDepreciationAndAmortizationAddBacksAdjustments_019ef38a-eea7-7c38-8ba9-880495371e96" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementGain_019e64a9-9672-7ea7-b9a6-aae0381db9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationSettlementGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_LitigationSettlementGain_019e64a9-9672-7ea7-b9a6-aae0381db9f1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019fa455-cc98-7add-a9b9-db26282a131e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_019e64a9-9672-71ba-a832-308efb10687a" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019fa455-cc98-7add-a9b9-db26282a131e" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.madisonair.com/role/SegmentInformationSummaryofnetsalesandassetsbygeographicareaDetails" xlink:type="simple" xlink:href="mair-20260630.xsd#SegmentInformationSummaryofnetsalesandassetsbygeographicareaDetails"/>
  <link:definitionLink xlink:role="http://www.madisonair.com/role/SegmentInformationSummaryofnetsalesandassetsbygeographicareaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019e64a9-9672-71fe-a3b1-0984dd6dd29d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e64a9-9672-79ac-83ab-171c7839933a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019e64a9-9672-71fe-a3b1-0984dd6dd29d" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e64a9-9672-79ac-83ab-171c7839933a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019e64a9-9672-7436-a8cb-7569742b4308" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e64a9-9672-79ac-83ab-171c7839933a" xlink:to="loc_srt_StatementGeographicalAxis_019e64a9-9672-7436-a8cb-7569742b4308" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e64a9-9672-7436-a8cb-7569742b4308_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019e64a9-9672-7436-a8cb-7569742b4308" xlink:to="loc_srt_SegmentGeographicalDomain_019e64a9-9672-7436-a8cb-7569742b4308_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e64a9-9672-7cda-949e-df3ad6b6869e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019e64a9-9672-7436-a8cb-7569742b4308" xlink:to="loc_srt_SegmentGeographicalDomain_019e64a9-9672-7cda-949e-df3ad6b6869e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e64a9-9672-7377-8370-ddaa6f1510c3" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e64a9-9672-7cda-949e-df3ad6b6869e" xlink:to="loc_country_US_019e64a9-9672-7377-8370-ddaa6f1510c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_019e64a9-9672-7120-90da-f01c723eb2ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e64a9-9672-7cda-949e-df3ad6b6869e" xlink:to="loc_us-gaap_NonUsMember_019e64a9-9672-7120-90da-f01c723eb2ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mair_AmericasExcludingUnitedStatesMember_019e64a9-9672-7f22-a343-44ad7939a838" xlink:href="mair-20260630.xsd#mair_AmericasExcludingUnitedStatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonUsMember_019e64a9-9672-7120-90da-f01c723eb2ee" xlink:to="loc_mair_AmericasExcludingUnitedStatesMember_019e64a9-9672-7f22-a343-44ad7939a838" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_019e64a9-9672-7413-a41a-024aa61e4443" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonUsMember_019e64a9-9672-7120-90da-f01c723eb2ee" xlink:to="loc_srt_EuropeMember_019e64a9-9672-7413-a41a-024aa61e4443" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_019e64a9-9672-7eb4-a5c2-cfdcd7074be3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonUsMember_019e64a9-9672-7120-90da-f01c723eb2ee" xlink:to="loc_srt_AsiaPacificMember_019e64a9-9672-7eb4-a5c2-cfdcd7074be3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e64a9-9672-7445-ba70-c5ff75db9776" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019e64a9-9672-71fe-a3b1-0984dd6dd29d" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e64a9-9672-7445-ba70-c5ff75db9776" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_019e64a9-9672-787c-851f-7874fb3dbd05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019e64a9-9672-71fe-a3b1-0984dd6dd29d" xlink:to="loc_us-gaap_NoncurrentAssets_019e64a9-9672-787c-851f-7874fb3dbd05" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
