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Leases - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) engine aircraft transaction | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Operating aircraft leases, minimum remaining lease term | 2 months |  |
Operating aircraft leases, maximum remaining lease term | 4 years |  |
Finance leases, number of spare engines | engine | 12 |  |
Operating leases, number of spare engines | engine | 26 |  |
Number of transactions | transaction | 2 |  |
Gain on sale leaseback transactions | $ | $ 17,000,000 | $ 0 | $ 0
Facility leases, minimum lease term remaining | 1 month |  |
Facility leases, maximum lease term remaining | 14 years |  |
Embraer E190 Fleet |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Impairment losses | $ | $ 0 | $ 0 | $ 52,000,000
Aircraft |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of aircraft operated | 290 |  |
Number of aircraft accounted for under operating leases | 26 |  |
Finance lease, number of aircraft leases | 0 |  |
Number of aircraft having purchase options | 8 |  |

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