Special Charges and Credits (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) aircraft	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 27, 2022
Property, Plant and Equipment [Line Items]
Special charges (credits)		$ 420,172	$ (377,715)	$ (302,761)
Payroll Support Program 2 and 3, Grant, CARES Act
Property, Plant and Equipment [Line Items]
Special charges (credits)			(342,200)
Severance costs and costs for involuntary separations			2,000
Severance costs and costs for voluntary and involuntary separations	$ 2,500
Payroll Support Program, CARES Act
Property, Plant and Equipment [Line Items]
Special charges (credits)				(266,800)
CARES Act Employee Retention
Property, Plant and Equipment [Line Items]
Special charges (credits)				$ (38,500)
CARES Act Employee Retention Credit
Property, Plant and Equipment [Line Items]
Special charges (credits)			$ (37,500)
Frontier Merger Agreement And Jetblue Unsolicited Proposal
Property, Plant and Equipment [Line Items]
Legal, advisory and other fees		47,200
Retention bonus recorded		39,300
Frontier Merger Agreement
Property, Plant and Equipment [Line Items]
Percentage of target retention bonus to be paid upon merger failure or abandonment					50.00%
JetBlue Merger Agreement
Property, Plant and Equipment [Line Items]
Percentage of target retention bonus to be paid upon merger failure or abandonment					50.00%
Airbus A319 | Aircraft | Impairment due to Planned Acceleration of Plane Retirement
Property, Plant and Equipment [Line Items]
Special charges (credits)		$ 333,700
Number of aircraft, accelerated retirement | aircraft		29