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Commitments and Contingencies (Details) - Future aircraft purchase commitments
$ in Millions
Mar. 31, 2021
USD ($)
Future aircraft purchase commitments:  
Nine months ending December 31, 2021 $ 750
2022 2,480
2023 2,310
2024 2,960
2025 2,750
Thereafter 2,110
Total $ 13,360