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Deficit) Product and Service [Axis] Product and Service [Axis] Amortization from cash flow hedges, net of adjustment for deferred tax benefit (expense) of less than $1 for each of the three and six months ended June 30, 2026 and 2025 Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Airport Facility Airport Facility [Member] Airport Facility Amount of employees represented by unions Percentage of Workforce Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Entity's Employees, Percentage Litigation settlement, fee expense Litigation Settlement, Fee Expense Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cash settlement (less than) Class of Warrant or Right, Expense or Revenue Recognized Equity Awards Adjustments Equity Awards Adjustments [Member] Dispatchers Collective-Bargaining Arrangement, Employee Group, Dispatchers [Member] Collective-Bargaining Arrangement, Employee Group, Dispatchers Remainder of 2026 Purchase Obligation, to be Paid, Remainder of Fiscal Year Total liabilities and stockholders’ equity Liabilities and Equity Variable lease cost Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Air traffic liability balance Contract With Customer, Liability, Air Traffic Contract With Customer, Liability, Air Traffic Plan Name [Axis] Plan Name [Axis] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Gains recognized on sale-leaseback transactions Gains recognized on sale-leaseback transactions Sale and Leaseback Transaction, Gain (Loss), Net Additional paid-in capital Additional Paid in Capital Other operating Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] Total Aircraft Air Transportation Equipment [Member] Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Preferred stock authorized for issuance (in shares) Preferred Stock, Shares Authorized Number of union-represented employee groups Multiemployer Plan, Number Of Employee Groups Multiemployer Plan, Number Of Employee Groups Adjustment to Compensation: Adjustment to Compensation [Axis] Unearned Membership Fees Unearned Membership Fees [Member] Unearned Membership Fees Class of Stock [Domain] Class of Stock [Domain] Other Ground Property And Equipment Other Ground Property And Equipment [Member] Other Ground Property And Equipment Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] PSP1 Promissory Note Payroll Support Program, Promissory Note One [Member] Payroll Support Program, Promissory Note One Passenger and other taxes and fees payable Passenger Taxes and Fees Payable, Current Passenger Taxes and Fees Payable, Current Credit Facility [Axis] Credit Facility [Axis] Supplies and other current assets Increase (Decrease) In Supplies And Other Current Assets Increase (Decrease) In Supplies And Other Current Assets Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Unrealized gains (losses) from cash flow hedges net of adjustment for de-designation of fuel hedges, tax benefit/(expense) (less than) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Description [Axis] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Depreciation and amortization Depreciation, Depletion and Amortization, Excluding Accelerated Depreciation Depreciation, Depletion and Amortization, Excluding Accelerated Depreciation Company Selected Measure Amount Company Selected Measure Amount Maintenance Controllers Collective-Bargaining Arrangement, Employee Group, Maintenance Controllers [Member] Collective-Bargaining Arrangement, Employee Group, Maintenance Controllers Third party lessors, number of aircraft Lessee, Number Of Aircraft Lessee, Number Of Aircraft Supplier incentives Supplier Incentives, Current Supplier Incentives, Current Flight Attendants Collective-Bargaining Arrangement, Employee Group, Flight Attendants [Member] Collective-Bargaining Arrangement, Employee Group, Flight Attendants Pilots Collective-Bargaining Arrangement, Employee Group Pilots [Member] Collective-Bargaining Arrangement, Employee Group Pilots Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Acquired aircraft and engines through operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted average grant date fair value, for vested shares (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax expense (benefit) Income Tax Expense (Benefit) Schedule of Collective Bargaining Agreements Multiemployer Plan [Table Text Block] Adjustments to reconcile net loss to cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Total Purchase Obligation Award Timing Method Award Timing Method [Text Block] Consolidation Consolidation, Policy [Policy Text Block] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Other Other revenues Product and Service, Other [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Aircraft fuel Fuel Costs Net income (loss) Net loss Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Interest income and other Investment Income, Interest Air traffic liability Increase (Decrease) in Contract with Customer, Liability, Air Traffic Increase (Decrease) in Contract with Customer, Liability, Air Traffic Non-Market Based Condition Non-Market Based Condition [Member] Non-Market Based Condition Air traffic liability Contract With Customer, Liability, Air Traffic, Current Contract With Customer, Liability, Air Traffic, Current Operating revenues: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Diluted: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]