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v3.24.0.1

Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Fixed Rate Notes (Details) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) aircraft | Aug. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) aircraft | Nov. 30, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft | Mar. 30, 2014 USD ($) aircraft | Apr. 30, 2013 USD ($)
Fixed rate specialty bonds, due through 2036 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 42,000,000
Debt instrument, net amount |  |  |  |  |  |  |  | 43,000,000
Debt instrument, unamortized premium |  |  |  |  |  |  |  | $ 1,000,000
Secured debt | $ 43,000,000 | $ 43,000,000 |  |  |  |  |  |
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 808,000,000 |  | $ 772,000,000 |  |  |
2019-1 Series B, due through 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured debt | 71,000,000 | 83,000,000 |  |  |  |  |  |
2019-1 Series B, due through 2027 | Long-term Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 115,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 8.00% |  |  |  |  |
2019-1 Series B, due through 2027 | Long-term Debt | Airbus A321 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of aircraft, secured debt transactions | aircraft |  |  | 24 |  | 25 |  |  |
2020-1 Series A, due through 2032 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured debt | 511,000,000 | 552,000,000 |  |  |  |  |  |
2020-1 Series A, due through 2032 | Long-term Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 636,000,000 |  | $ 589,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  | 4.00% |  | 2.75% |  |  |
2020-1 Series B, due through 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured debt | 118,000,000 | 136,000,000 |  |  |  |  |  |
2020-1 Series B, due through 2028 | Long-term Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 172,000,000 |  | $ 183,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  | 7.75% |  | 2.95% |  |  |
Fixed rate enhanced equipment notes, due through 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured debt | 0 | 61,000,000 |  |  |  |  |  |
Fixed rate enhanced equipment notes, due through 2023 | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 226,000,000 |
Number of aircraft, secured debt transactions | aircraft |  |  |  |  |  |  | 8 |
Repayments of debt | 61,000,000 |  |  |  |  |  |  |
Fixed rate enhanced equipment notes, due through 2023 | Secured Debt | A-320-200 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  |  |  |  | 14 |
Fixed rate equipment notes, due through 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 11,000,000 |  | $ 219,000,000 |  | $ 567,000,000 |  |
Secured debt | $ 323,000,000 | $ 448,000,000 |  |  |  |  |  |
Fixed rate equipment notes, due through 2028 | Secured Debt | A-320 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  | 10 |  | 14 |  |
Fixed rate equipment notes, due through 2028 | Secured Debt | A-321 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  | 2 |  | 10 |  |
Fixed rate equipment notes, due through 2028 | Secured Debt | E190 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of aircraft, secured debt transactions | aircraft |  | 5 |  |  |  |  |  |

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