Special Charges (Credits) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jul. 27, 2022
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)	$ 38,359	$ (85,775)		$ 71,926	$ (377,715)
Payroll Support Program 2 and 3, Grant, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)		86,400			342,200
CARES Act Employee Retention Credit
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)			$ (37,500)
Payroll Support Program 2 and 3
Unusual or Infrequent Item, or Both [Line Items]
Severance costs and costs for voluntary separations		$ 600			$ 2,000
Frontier Merger Agreement and Jetblue Unsolicited Proposal
Unusual or Infrequent Item, or Both [Line Items]
Legal, advisory and other fees	17,700			39,200
Retention bonus recorded	$ 20,600			$ 32,700
Frontier Merger Agreement
Unusual or Infrequent Item, or Both [Line Items]
Percentage of target retention bonus to be paid upon merger failure or abandonment						50.00%
JetBlue Merger Agreement
Unusual or Infrequent Item, or Both [Line Items]
Percentage of target retention bonus to be paid upon merger failure or abandonment	50.00%			50.00%