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COMMITMENTS AND CONTINGENCIES - Aircraft Commitments by Year (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Future aircraft purchase commitments:  
Total $ 18,700
Future aircraft purchase commitments  
Future aircraft purchase commitments:  
Nine months ending December 31, 2023 2,360
2023 4,460
2024 4,290
2025 3,830
2026 2,580
Thereafter 1,200
Total $ 18,720