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COMMITMENTS AND CONTINGENCIES - Aircraft Commitments by Year (Details)
$ in Millions
Mar. 31, 2024
USD ($)
Future aircraft purchase commitments:  
Total $ 20,700
Future aircraft purchase commitments  
Future aircraft purchase commitments:  
Nine months ending December 31, 2024 2,990
2024 3,970
2025 4,990
2026 5,020
2027 2,980
Thereafter 770
Total $ 20,720