Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Carrying Amount Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Percentage of principal amount bearing fixed interest rate Debt Instrument, Issue Price, Percentage Of Principal Debt Instrument, Issue Price, Percentage Of Principal Adjustment to Compensation, Amount Adjustment to Compensation Amount Aircraft rent Airline, Aircraft Rent Expense Loans and Leases from Non-U.S. Entities Loans And Leases From Non U S Entities [Member] Loans And Leases From Non U.S Entities [Member] Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 324,889,913 and 323,470,682 shares at September 30, 2026 and December 31, 2025, respectively Common stock at par, $0.01 par value; authorized 1,000 shares; issued and outstanding 1,000 shares at both September 30, 2026 and December 31, 2025 Common Stock, Value, Issued Accrued salaries and benefits Employee-related Liabilities, Current Regional capacity purchase Airline, Capacity Purchase Arrangement Expense PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Retirement Benefits [Text Block] Passenger revenue Passenger revenue Passenger [Member] Restatement Determination Date Restatement Determination Date Nonoperating unrealized (gains) losses on investments, net Gain (Loss) On Financial Instruments, Non-Operating Gain (Loss) On Financial Instruments, Non-Operating Proceeds from sale of short-term and other investments Proceeds from Sale, Maturity and Collection of Investments Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Changes in value Other Comprehensive Income (Loss) before Reclassifications, Tax Measurement Frequency [Axis] Measurement Frequency [Axis] Number of shares purchased as a result of warrants exercised (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Aircraft fuel, spare parts and supplies, net Aircraft fuel, spare parts and supplies, net Airline Related Inventory, Net Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Investments [Domain] Investments [Domain] 2026 Notes 4.375% Secured Notes Due 2026 [Member] 4.375% Secured Notes Due 2026 Other comprehensive income (loss), net of tax: Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Number of aircraft operated Airline, Aircraft Operated, Number Investment interests received in exchange for loans, goods and services Other Significant Noncash Transaction, Value of Consideration Received Total noncurrent liabilities Liabilities, Noncurrent Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Total nonoperating special charges and unrealized (gains) losses on investments, net Special Charges And Unrealized Losses (Gains) On Financial Instruments, Non-Operating, Before Tax Special Charges And Losses On Financial Instruments, Nonoperating, Before Tax Entity Address, State or Province Entity Address, State or Province Republic Airways Republic Airways Holdings Inc. [Member] Republic Airways Holdings Inc. 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Schedule of Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Current maturities of long-term debt, finance leases, and other financial liabilities Long-Term Debt and Lease Obligation, Current Property and equipment acquired through the issuance or modification of debt, finance leases and other financial liabilities Noncash Or Part Noncash Acquisition, Fixed Assets Acquired, Net Of Vendor Credits Noncash Or Part Noncash Acquisition, Fixed Assets Acquired, Net Of Vendor Credits Minimum Minimum [Member] Frequent Flyer Program Frequent Flyer Program [Member] Frequent Flyer Program [Member] Investment Type [Axis] Investment Type [Axis] Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Short-term investments: Investments, Fair Value Disclosure Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net of income taxes Special Charges (Credits), Net of Income Tax Benefit Total special items in the period. 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[Member] Mesa Airlines Inc. 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United Air Lines Inc [Member] United Airlines, Inc. 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