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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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