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Commitments and Contingencies - Aircraft Purchase Commitments By Period (Details) - Future aircraft purchase commitments
$ in Millions
Sep. 30, 2020
USD ($)
Future aircraft purchase commitments:  
Three months ending December 31, 2020 $ 380
2021 1,310
2022 2,460
2023 2,310
2024 2,960
Thereafter 4,810
Total $ 14,230