Segment Reporting - Operating Revenue and Direct Contribution For Our Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenue:
Customer incentive asset amortization	$ (9,864)	$ (11,443)	$ (19,915)	$ (21,924)
Other	5,790	5,610	11,472	10,787
Total Operating Revenue	1,179,971	990,432	2,217,127	1,851,732
Direct Contribution:
Total Direct Contribution for Reportable Segments	208,977	242,559	411,705	422,272
Unallocated income and (expenses), net	(93,361)	(102,464)	(194,101)	(163,998)
Loss on early extinguishment of debt	(689)	0	(689)	0
Unrealized loss on financial instruments	0	0	0	(113)
Special charge	0	0	(2,633)	0
Transaction-related expenses	0	(117)	0	(318)
Gain (loss) on disposal of flight equipment	(19)	0	6,221	(16)
Income before income taxes	114,908	139,978	220,503	257,827
Interest income	(873)	(189)	(1,113)	(400)
Interest expense	19,924	26,992	40,347	54,172
Capitalized interest	(3,339)	(1,850)	(7,103)	(3,121)
Loss on early extinguishment of debt	689	0	689	0
Unrealized loss on financial instruments	0	0	0	113
Other (income) expense, net	837	(4,854)	219	(44,310)
Operating Income	132,146	160,077	253,542	264,281
Airline Operations [Member]
Operating Revenue:
Operating Revenue	1,142,731	955,861	2,138,086	1,782,101
Direct Contribution:
Total Direct Contribution for Reportable Segments	196,331	231,793	382,150	400,943
Dry Leasing [Member]
Operating Revenue:
Operating Revenue	41,314	40,404	87,484	80,768
Direct Contribution:
Total Direct Contribution for Reportable Segments	$ 12,646	$ 10,766	$ 29,555	$ 21,329