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Commitments and Contingencies - Aircraft Purchase Commitments By Period (Details) - Future aircraft purchase commitments
$ in Millions
Sep. 30, 2019
USD ($)
Future aircraft purchase commitments:  
Three months ending December 31, 2019 $ 390
2020 2,900
2021 3,680
2022 3,330
2023 1,640
Thereafter 1,940
Total $ 13,880