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COVID-19 COVID-19 Segment (Details)	1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) engine Aircraft	Jun. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Operating Special Charge, Total		$ 33,585,000		$ 280,852,000
Non-Operating Special Charge, Total		0		26,632,000
Special Charges		33,585,000		307,484,000
Asset Impairment Charges				168,400,000
Other Aircraft Related Costs				$ 89,300,000
Number of Engines Retired | engine				5
Number Of Aircraft In Sale-Leaseback Transactions | Aircraft				7
Postemployment Benefits, Period Expense				$ 21,500,000
Termination Loans					$ 19,800,000
Payments for Loans		14,900,000
Other Expenses				$ 3,500,000
Airbus A320 Aircraft Series
Segment Reporting Information [Line Items]
Number of Aircraft Retired | Aircraft				7
Subsequent Event
Segment Reporting Information [Line Items]
Payments for Loans	$ 4,900,000
Allegiant Air
Segment Reporting Information [Line Items]
Operating Special Charge		32,617,000		$ 118,059,000
Non-Operating Special Charge		0		0
Special Charges		32,617,000		118,059,000
Asset Impairment Charges				5,000,000.0
Postemployment Benefits, Period Expense				21,100,000
Sunseeker Resorts
Segment Reporting Information [Line Items]
Operating Special Charge		0		135,443,000
Non-Operating Special Charge		0		26,632,000
Special Charges		0		162,075,000
Asset Impairment Charges			$ 0	136,800,000
Postemployment Benefits, Period Expense				400,000
Construction Suspension Expense				5,000,000.0
Other
Segment Reporting Information [Line Items]
Operating Special Charge		968,000		27,350,000
Non-Operating Special Charge		0		0
Special Charges		$ 968,000		27,350,000
Asset Impairment Charges				$ 26,600,000

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