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Current and noncurrent deferred revenue, beginning Current and noncurrent deferred revenue, ending Contract with Customer, Liability A321-200neo A321-200neo [Member] A321-200neo [Member] Other segment items Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Widebody Aircraft Widebody Aircraft [Member] Widebody Aircraft Travel-related services Passenger, Travel Related Services [Member] Passenger, Travel Related Services [Member] Cash, cash equivalents and restricted cash equivalents at beginning of period Cash, cash equivalents and restricted cash equivalents at end of period Total cash, cash equivalents and restricted cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Other accrued liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Aircraft purchase commitments, minimum quantity required Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required Cargo Cargo and Freight [Member] Derivative Instrument Gains Type [Axis] Derivative Instrument Gains Type [Axis] Derivative Instrument Gains Type Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Ownership interest (percent) Equity Method Investment, Ownership Percentage Salaries and related costs Airline salaries and related costs Labor and Related Expense Financing secured by aircraft - Certificates Certificates [Member] Certificates [Member] Airline Destinations [Axis] Airline Destination [Axis] Financing secured by aircraft - Notes Aircraft Financings [Member] Aircraft Financings [Member] NYTDC Special Facilities Revenue Bonds NYTDC Special Facilities Revenue Bonds [Member] NYTDC Special Facilities Revenue Bonds Schedule of Debt Schedule of Debt [Table Text Block] Warrants exercised (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Number of reportable segments not disclosed flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Investment, Name [Domain] Investment, Name [Domain] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic Earnings Per Share (USD per share) Basic earnings per share (USD per share) Earnings Per Share, Basic Deferred revenue liability, current Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Payments on debt and finance lease obligations Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security Total long-term debt Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Debt agreements modified Noncash Transaction Debt Agreements Modified Noncash Transaction Debt Agreements Modified Wheels Up Wheels Up [Member] Wheels Up Retained earnings Retained Earnings (Accumulated Deficit) O 2026 Q2 June Dividends O 2026 Q2 June Dividends [Member] O 2026 Q2 June Dividends Product and Service [Axis] Product and Service [Axis] Carrying Value Equity Securities, FV-NI 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] Pension Benefits Pension Plan [Member] Common Stock Common Stock [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Cover page. Cover [Abstract] Delta Delta [Member] Delta 2027 Unrecorded Unconditional Purchase Obligation, to be Paid, Year One Derivative Contract [Domain] Derivative Contract [Domain] Miles redeemed for air travel Loyalty Program Liability, Travel Mileage Credits Redeemed Loyalty Program Liability, Travel Mileage Credits Redeemed Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and stockholders' equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Tabular List, Table Tabular List [Table Text Block] Restricted cash included in other noncurrent assets Restricted Cash and Cash Equivalent, Noncurrent Miscellaneous, net Other Nonoperating Income (Expense) Other non-operating expense (income) Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Right-of-use assets acquired or modified under operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, Modified Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, Modified 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] Equity Securities, Investment Name [Axis] Equity Securities, Investment Name [Axis] Equity Securities, Investment Name Schedule of Equity Investments Ownership and Carrying Value - Fair Value Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Noncurrent Assets: Noncurrent assets: Assets, Noncurrent [Abstract] Other financings Other Financings [Member] Other Financings [Member] Accounts receivable, net of allowance for uncollectible accounts of $13 and $13 Receivables, Net, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Long-Term Investments and Related Investment, Policy [Policy Text Block] Debt and finance leases Long-Term Debt and Lease Obligation Name Measure Name 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] Unifi Aviation Unifi [Member] Unifi Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Air traffic liability Ticket Passenger, Air Traffic [Member] Passenger, Air Traffic [Member] Dividends [Axis] Dividends [Axis] Name Trading Arrangement, Individual Name Pacific Pacific Destination [Member] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization 2030 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four Current Assets: Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income Tax Provision Income Tax Expense (Benefit) Refinery cost of goods sold Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] China Eastern China Eastern [Member] China Eastern [Member] Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Other Product and Service, Other [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Unsecured Notes Unsecured Notes [Member] Unsecured Notes [Member] Recognized net actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Loyalty travel awards Passenger, Loyalty Travel Awards [Member] Passenger, Loyalty Travel Awards [Member] Aircraft fuel and related taxes Aircraft fuel and related costs Fuel Costs AOCI Attributable to Parent, Net of Tax AOCI Attributable to Parent, Net of Tax [Roll Forward] Net Income Net (loss) income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Restricted cash equivalents Restricted Investments, at Fair Value Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Activity in Loyalty Program Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Proceeds from short-term obligations Proceeds from Short-Term Debt Operating Revenue: Revenues [Abstract] Three months ending December 31, 2026 Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Non-Cash Transactions: Other Noncash Investing and Financing Items [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]