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LEASES - Narrative (Details) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2025 aircraft | Mar. 31, 2025 USD ($) aircraft | Dec. 31, 2024 USD ($) aircraft | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) aircraft | Dec. 31, 2022 USD ($) aircraft | Jan. 31, 2025 aircraft | Sep. 30, 2023 aircraft | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) aircraft airframe | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale-leaseback transactions |  |  |  |  |  |  |  |  |  |  | $ 92,000,000 | $ 0 | $ 0
Operating lease right-of-use assets |  |  | $ 1,369,000,000 |  |  |  |  |  |  | $ 1,223,000,000 | 1,369,000,000 | 1,223,000,000 |
Operating lease, liability |  |  | 1,359,000,000 |  |  |  |  |  |  |  | 1,359,000,000 |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 2,054,000,000 | 3,520,000,000 | 3,924,000,000
Payments of long-term debt and finance lease obligations |  |  |  |  |  |  |  |  |  |  | 1,337,000,000 | 85,000,000 | 2,437,000,000
Total lease obligations |  |  | 91,000,000 |  |  |  |  |  |  | 104,000,000 | 91,000,000 | 104,000,000 |
Aircraft |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 45,000,000 |  |
Payments of long-term debt and finance lease obligations |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Payments of long-term debt and operating lease obligations |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Total lease obligations |  |  | $ 40,000,000 |  |  |  |  |  |  |  | 40,000,000 |  |
Gain (loss) on termination of lease |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Number of leased aircrafts, operating lease | aircraft |  |  | 88 |  |  |  |  |  |  |  | 88 |  |
Number of leased aircrafts, finance lease | aircraft |  |  | 18 |  |  |  |  |  |  |  | 18 |  |
Aircraft | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sale agreements | aircraft |  |  |  |  |  |  |  | 36 |  |  |  |  |
Aircraft | Boeing 737-800 |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sale agreements | aircraft |  |  | 36 |  |  |  |  |  |  |  |  |  |
Number of aircrafts sold | aircraft |  |  | 35 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property, plant, and equipment |  |  | $ 871,000,000 |  |  |  |  |  |  |  |  |  |
Number of aircrafts de-recognized | aircraft |  |  | 35 |  |  |  |  |  |  |  |  |  |
Gain on sale-leaseback transactions |  |  | $ 92,000,000 |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  | 319,000,000 |  |  |  |  |  |  |  | $ 319,000,000 |  |
Operating lease, liability |  |  | $ 319,000,000 |  |  |  |  |  |  |  | $ 319,000,000 |  |
Number of aircraft purchase agreements | aircraft |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of airframe purchase agreements | airframe |  |  |  |  |  |  |  |  |  |  | 1 |  |
Aircraft | Boeing 737-800 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts sold | aircraft | 1 | 1 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property, plant, and equipment |  | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, lease term (in years) |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Gain on sale-leaseback transactions |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Aircraft | Boeing 737-700 |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft purchase agreements | aircraft |  |  |  |  |  |  | 39 |  | 4 |  | 2 |  |
Capital expenditures |  |  |  |  |  | $ 88,000,000 | $ 365,000,000 |  |  | 44,000,000 |  |  |
Payments of long-term debt and finance lease obligations |  |  |  |  |  | 50,000,000 | 191,000,000 |  |  | 3,000,000 |  |  |
Total lease obligations |  |  |  |  |  | 38,000,000 | 174,000,000 |  |  | $ 41,000,000 |  | $ 41,000,000 | $ 174,000,000
Gain (loss) on termination of lease |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Number of aircrafts purchased | aircraft |  |  |  |  |  | 8 | 31 |  |  |  |  |  |
Airport-Related |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of lease contract (in years) |  |  | 36 years |  |  |  |  |  |  |  | 36 years |  |
Maximum | Aircraft |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of contract (in years) |  |  |  |  |  |  |  |  |  |  | 9 years |  |
Renewal term (in years) |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Maximum | Aircraft | Boeing 737-800 |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, lease term (in years) |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Maximum | Airport-Related |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal term (in years) |  |  | 11 years |  |  |  |  |  |  |  | 11 years |  |
Maximum | Other |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of contract (in years) |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Renewal term (in years) |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Minimum | Aircraft |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal term (in years) |  |  |  |  |  |  |  |  |  |  | 3 months |  |
Minimum | Aircraft | Boeing 737-800 |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, lease term (in years) |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Minimum | Airport-Related |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal term (in years) |  |  | 1 year |  |  |  |  |  |  |  | 1 year |  |
Minimum | Other |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal term (in years) |  |  |  |  |  |  |  |  |  |  | 6 months |  |

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