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Commitments and Contingencies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
aircraft
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Commitments to acquire aircraft      
Minimum aircraft delivery delays that could trigger lessee cancellation clauses (in years) 1 year    
Commitments for the acquisition of the aircraft and other equipment      
2020 | $ $ 3,883,733    
2021 | $ 6,083,797    
2022 | $ 6,422,783    
2023 | $ 5,344,481    
2024 | $ 3,257,547    
Thereafter | $ 2,428,668    
Total | $ 27,421,009    
Office Lease      
Office lease expense, net of sublease income | $ 6,700 $ 2,900 $ 2,300
Commitments for minimum rentals under the non-cancelable lease term      
2020 | $ 6,892    
2021 | $ 7,063    
2022 | $ 6,512    
2023 | $ 6,390    
2024 | $ 4,547    
Thereafter | $ 33,054    
Total | $ $ 64,458    
Aircrafts      
Commitments to acquire aircraft      
2020 46    
2021 76    
2022 92    
2023 88    
2024 60    
Thereafter 51    
Total 413    
Commitments for the acquisition of the aircraft and other equipment      
Deposit Assets | $ $ 1,600,000 $ 1,800,000  
Airbus A220-300      
Commitments to acquire aircraft      
2021 5    
2022 10    
2023 10    
2024 10    
Thereafter 15    
Total 50    
Airbus A320/321neo      
Commitments to acquire aircraft      
2020 25    
2021 26    
2022 32    
2023 25    
2024 16    
Thereafter 36    
Total 160    
Number of long-range variants | item 52    
Number of extra long-range variants | item 29    
Airbus A220 | Maximum      
Commitments for the acquisition of the aircraft and other equipment      
Aircraft to be acquired under non-binding commitment 25    
Airbus A330-900neo      
Commitments to acquire aircraft      
2020 1    
2021 5    
2022 6    
2023 3    
Total 15    
Airbus A350-900/1000      
Commitments to acquire aircraft      
2020 3    
2021 6    
2022 3    
2023 4    
2024 4    
Total 20    
Boeing 737-7/8/9 MAX      
Commitments to acquire aircraft      
2020 4    
2021 25    
2022 35    
2023 41    
2024 30    
Total 135    
Boeing 787-9/10      
Commitments to acquire aircraft      
2020 13    
2021 9    
2022 6    
2023 5    
Total 33    
Boeing 737-8 MAX Aircraft | Maximum      
Commitments for the acquisition of the aircraft and other equipment      
Aircraft to be acquired under non-binding commitment 45