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v3.25.0.1

Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Fixed Rate Notes (Details) | Dec. 31, 2024 USD ($) aircraft | Dec. 31, 2022 USD ($) | Aug. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) | Apr. 30, 2013 USD ($)
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Fixed rate special facility bonds, due through 2036 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 42,000,000
Debt instrument, net amount |  |  |  |  |  |  | 43,000,000
Debt instrument, unamortized premium |  |  |  |  |  |  | $ 1,000,000
Fixed Rate Enhanced Equipment Notes, 2019-1 Equipment Notes | Long-term Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 772,000,000 |  |
Fixed Rate Enhanced Equipment Notes, 2019-1 Equipment Notes | Long-term Debt | Airbus A321 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of aircraft, secured debt transactions | aircraft |  |  |  |  | 25 |  |
2019-1 Series AA, due through 2032 | Long-term Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 589,000,000 |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 2.75% |  |
2019-1 Series A, due through 2028 | Long-term Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 183,000,000 |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 2.95% |  |
2019-1 Series B, due through 2027 | Long-term Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 115,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 8.00% |  |  |  |
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 808,000,000 |  |  |  |
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt | Airbus A321 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of aircraft, secured debt transactions | aircraft |  |  | 24 |  |  |  |
2020-1 Series A, due through 2032 | Long-term Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 636,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 4.00% |  |  |  |
2020-1 Series B, due through 2028 | Long-term Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 172,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 7.75% |  |  |  |
Fixed rate equipment notes, due through 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  | $ 11,000,000 |  | $ 219,000,000 |  | $ 567,000,000 |
Fixed rate equipment notes, due through 2028 | Long-term Debt | Airbus A321 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft | 23 |  |  |  |  |  |
2024 Floating Rate Equipment Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | $ 662,000,000 |  |  |  |  |  |

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