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LEASES - Related Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Accumulated amortization | $ 452 | $ 477
Operating | 1,369 | 1,223
Finance | 102 | 125
Total lease assets | $ 1,471 | $ 1,348
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Flight equipment | Flight equipment
Current |  |
Operating | $ 328 | $ 208
Finance | $ 22 | $ 29
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Less current maturities | Less current maturities
Noncurrent |  |
Operating | $ 1,031 | $ 985
Finance | $ 69 | $ 75
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term debt less current maturities | Long-term debt less current maturities
Total lease liabilities | $ 1,450 | $ 1,297

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