Commitments and Contingencies (Details) $ in Thousands		6 Months Ended
	Aug. 03, 2017 lease	Jun. 30, 2017 USD ($) item aircraft	Dec. 31, 2016 USD ($)
Commitments to acquire aircraft
Lease contracts, subject to cancellation | lease	0
Minimum aircraft delivery delays that could trigger lessee cancellation clauses (in years)		1 year
Commitments for the acquisition of the aircraft and other equipment
2017 | $		$ 1,528,931
2018 | $		4,246,763
2019 | $		5,703,782
2020 | $		6,048,859
2021 | $		5,886,385
Thereafter | $		5,088,935
Total | $		$ 28,503,655
Aircrafts
Commitments to acquire aircraft
2017		12
2018		47
2019		77
2020		75
2021		78
Thereafter		84
Total		373
Commitments for the acquisition of the aircraft and other equipment
Total | $		$ 1,400,000	$ 1,300,000
Airbus A320/321neo
Commitments to acquire aircraft
2017		5
2018		17
2019		32
2020		26
2021		22
Thereafter		44
Total		146
Number of long-range variants		55
Airbus A330-900neo
Commitments to acquire aircraft
2018		7
2019		5
2020		5
2021		5
Thereafter		5
Total		27
Airbus 350-900/1000
Commitments to acquire aircraft
2017		2
2018		4
2019		2
2020		7
2021		9
Total		24
Airbus A350-1000
Commitments for the acquisition of the aircraft and other equipment
Aircraft to be acquired under non-binding commitment | aircraft		5
Boeing 737-800(2)
Commitments to acquire aircraft
Additional purchase commitments | aircraft		5
Boeing 737 7/8/9 MAX
Commitments to acquire aircraft
2017		2
2018		12
2019		26
2020		28
2021		35
Thereafter		27
Total		130
Boeing 787-9/10
Commitments to acquire aircraft
2017		3
2018		7
2019		12
2020		9
2021		7
Thereafter		8
Total		46