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Debt - Schedule of Debt Obligations (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 455 | $ 455 |  | $ 474
Less: current maturities of long-term debt, net | (263) | (263) |  | (251)
Less: total debt acquisition costs and other discounts, net | (3) | (3) |  | (4)
Long-term debt, net | $ 189 | 189 |  | 219
Principal repayments on debt |  | $ 161 | $ 51 |
Term, after interest-only period | 12 months | 12 months |  |
CARES Act Credit Agreement, Warrants |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Warrants to acquire common stock (in shares) | 3,117,940 | 3,117,940 |  |
Exercise price of warrants (in dollars per share) | $ 6.95 | $ 6.95 |  |
Secured Debt | Pre-delivery credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 300 | $ 300 |  | 312
Amount of unsecured borrowings available | $ 365 | $ 365 |  |
Term extension, maximum | 6 months | 6 months |  |
Secured Debt | Building note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 6 | $ 6 |  | 16
Principal repayments on debt | 16 |  |  |
Secured Debt | Fixed Income Interest Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured low interest loan amount | $ 6 | $ 6 |  |
Interest rate | 6.79% | 6.79% |  |
Unsecured Debt | Affinity card advance purchase of miles |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 66 | $ 66 |  | 66
Amount of unsecured borrowings available | 200 | 200 |  |
Unsecured Debt | PSP promissory notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 83 | $ 83 |  | $ 80
Interest rate | 1.00% | 1.00% |  |
Interest rate period |  | 5 years |  |
Debt instrument, variable interest rate |  | 2.00% |  |
Unsecured Debt | PSP1 Promissory Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loan term |  | 10 years |  |

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