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Commitments and Contingencies - Aircraft Purchase Commitments By Period (Details) - Future aircraft purchase commitments
$ in Millions
Jun. 30, 2020
USD ($)
Future aircraft purchase commitments:  
Six months ending December 31, 2020 $ 2,350
2021 4,290
2022 3,070
2023 1,860
2024 980
Thereafter 1,690
Total $ 14,240