Special Charges (Credits) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)	$ 18,004	$ (115,002)	$ 33,567	$ (291,940)
Payroll Support Program 2 and 3, Grant, CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)		99,300		255,800
Payroll Support Program 2
Unusual or Infrequent Item, or Both [Line Items]
Severance costs and costs for voluntary separations		600		1,400
CARES Act Employee Retention Credit
Unusual or Infrequent Item, or Both [Line Items]
Special charges (credits)		$ 16,300		$ 37,500
Frontier Merger Agreement and Jetblue Unsolicited Proposal
Unusual or Infrequent Item, or Both [Line Items]
Legal, advisory and other fees	10,400		21,500
Frontier Merger Agreement
Unusual or Infrequent Item, or Both [Line Items]
Retention bonus recorded	$ 7,600		$ 12,100
Frontier Merger Agreement | Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Percentage of target retention bonus to be paid upon merger failure or abandonment					50.00%