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LEASES - Narrative (Details) $ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) aircraft | Nov. 30, 2024 USD ($)
Lessee, Lease, Description [Line Items] |  |
Number of aircraft leases under various sale-leaseback transactions | 66 |
Lease terms of additional leases that have not yet commenced (up to) | 27 years |
Operating And Financing Leases, Lease Not Yet Commenced |  |
Lessee, Lease, Description [Line Items] |  |
Amount of leases that have not yet commenced | $ | $ 5.7 |
City Of Houston, Texas | SFRB |  |
Lessee, Lease, Description [Line Items] |  |
Par amount of debt | $ |  | $ 1.1
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Term of sale-leaseback transactions | 9 months |
Minimum | City Of Houston, Texas | SFRB |  |
Lessee, Lease, Description [Line Items] |  |
Stated interest rate |  | 5.25%
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Term of sale-leaseback transactions | 12 years |
Maximum | City Of Houston, Texas | SFRB |  |
Lessee, Lease, Description [Line Items] |  |
Stated interest rate |  | 5.50%
Mainline Aircraft |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircraft subject to operating leases | 66 |
Number of aircraft subject to finance leases | 8 |
Mainline Aircraft | Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Term of operating leases | 1 month |
Mainline Aircraft | Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Term of operating leases | 12 years |
Regional Aircraft |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircraft subject to operating leases | 219 |
Number of aircraft subject to finance leases | 21 |
Non-Aircraft | Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Term of operating leases | 1 month |
Non-Aircraft | Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Term of operating leases | 32 years |

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