Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,343,179	$ 922,631	$ 3,677,137	$ 2,243,219
Air traffic liability	495,815		495,815		$ 382,317
DOT—Domestic
Disaggregation of Revenue [Line Items]
Total operating revenues	1,163,193	801,766	3,154,984	1,980,762
DOT—Latin America
Disaggregation of Revenue [Line Items]
Total operating revenues	179,986	120,865	522,153	262,457
Total passenger revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	1,322,079	907,232	3,619,694	2,204,074
Fare
Disaggregation of Revenue [Line Items]
Total operating revenues	673,848	421,015	1,796,044	964,993
Non-fare
Disaggregation of Revenue [Line Items]
Total operating revenues	648,231	486,217	1,823,650	1,239,081
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 21,100	$ 15,399	$ 57,443	$ 39,145