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COMMITMENTS AND CONTINGENCIES - Aircraft Commitments by Year (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Future aircraft purchase commitments:  
Total $ 17,800
Future aircraft purchase commitments  
Future aircraft purchase commitments:  
Three months ending December 31, 2023 920
2024 3,520
2025 5,410
2026 3,850
2027 2,720
Thereafter 1,410
Total $ 17,830