Financial Derivative Instruments and Risk Management (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) aircraft	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) aircraft	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Fuel Derivative Contracts
Derivative [Line Items]
Cost of swap	$ 0	$ 0	$ 0	$ 0
Interest Rate Swap
Derivative [Line Items]
Cost of swap	$ 9,000,000	$ 0	$ 9,000,000	$ 0
Future aircraft deliveries with option to enter into and exercise cash settled swaps | aircraft	7		7
Notional amount	$ 245,000,000		$ 245,000,000
Unrealized losses from cash flow hedges net of adjustment for dedesignation of fuel hedges, net of deferred tax benefit			$ 10,000,000		$ 10,000,000
Minimum
Derivative [Line Items]
Interest rate risk, time period between agreements			7 years
Maximum
Derivative [Line Items]
Interest rate risk, time period between agreements			9 years