Special Charges and Credits (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) aircraft	Dec. 31, 2021 USD ($)	Jul. 28, 2022 installment	Jul. 27, 2022
Property, Plant and Equipment [Line Items]
Special charges (credits)	$ 69,537	$ 420,172	$ (377,715)
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
CARES Act Employee Retention Credit
Property, Plant and Equipment [Line Items]
Special charges (credits)			$ (37,500)
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
JetBlue Merger Agreement
Property, Plant and Equipment [Line Items]
Legal, advisory and other fees	50,000
Percentage of target retention bonus to be paid upon merger failure or abandonment				50.00%
Retention award payments, number of installments | installment				2
Retention bonus recorded	$ 19,500
Frontier Merger Agreement And Merger Agreement With Jet Blue
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%