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COMMITMENTS AND CONTINGENCIES - Aircraft Commitments by Year (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Future aircraft purchase commitments:  
Total $ 18,500
Future aircraft purchase commitments  
Future aircraft purchase commitments:  
Six months ending December 31, 2023 1,560
2024 3,590
2025 5,340
2026 3,840
2027 2,720
Thereafter 1,420
Total $ 18,470