Subsequent Events - Narrative (Details) - Subsequent Event $ in Millions	1 Months Ended
	Feb. 17, 2022 aircraft	Feb. 15, 2022 USD ($)
Subsequent Events
Stock repurchase program, authorized amount | $		$ 150.0
B-737-Max
Subsequent Events
Purchase commitment, number of aircraft	50
B-737-Max Incremental
Subsequent Events
Purchase commitment, number of aircraft	32
B-737-Max as a Result of Conversion of B-787
Subsequent Events
Purchase commitment, number of aircraft	18
B-787-9
Subsequent Events
Purchase commitment, number of aircraft converted	3