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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of the Company’s Debt (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | $ 455 | $ 474
Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 451 | 465
Pre-delivery credit facility | Carrying Value | Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 300 | 312
Pre-delivery credit facility | Estimated Fair Value | Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 304 | 316
Building note | Carrying Value | Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 6 | 16
Building note | Estimated Fair Value | Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 6 | 16
Affinity card advance purchase of miles | Carrying Value | Unsecured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 83 | 80
Affinity card advance purchase of miles | Estimated Fair Value | Unsecured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 81 | 76
PSP promissory notes | Carrying Value | Unsecured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | 66 | 66
PSP promissory notes | Estimated Fair Value | Unsecured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt, fair value | $ 60 | $ 57

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