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Commitments and Contingencies - Summary of Commitments (Details)
$ in Billions
Sep. 30, 2019
USD ($)
Aircraft
Commitments and Contingencies Disclosure [Abstract]  
Last three months of 2019 $ 1.5
2020 6.1
2021 3.8
2022 2.9
2023 2.3
After 2023 7.0
Total commitments $ 23.6
Number of aircrafts expected to be delivered in 2020 | Aircraft 17