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Unusual or Infrequently Occurring Items (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2021
Aircraft
Sep. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Aircraft
Dec. 31, 2020
USD ($)
Aircraft
Sep. 30, 2021
USD ($)
Apr. 30, 2021
USD ($)
Apr. 23, 2021
USD ($)
shares
Jan. 15, 2021
USD ($)
Oct. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Feb. 13, 2020
USD ($)
Feb. 01, 2019
USD ($)
Unusual or Infrequent Item, or Both [Line Items]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares             924          
Debt Instrument, Term 24 months                      
Operating Special Charge, Total     $ 13,998 $ 306,299                
Non-Operating Special Charge, Total     0 26,632                
Special Charges, Total     13,998 332,931                
Asset impairment charges       161,600                
Other Aircraft Related Costs     $ 2,500 $ 98,000                
Number of Aircraft Retired | Aircraft     2 8                
Number of Engines Retired | Aircraft     3 5                
Number of Aircraft In Sale-Leaseback Transactions | Aircraft 3   8 8                
Postemployment Benefits, Period Expense       $ 35,100                
Construction Suspension Expense       5,000                
Other Expenses     $ 500 6,600                
Total Proceeds from Payroll Support Program Grant           $ 98,400   $ 91,800        
Additional Proceeds Received from Payroll Support Program             $ 13,800          
Debt Instrument, Face Amount         $ 84,000   $ 1,700   $ 150,000 $ 31,000 $ 545,500 $ 450,000
Share-based Payment Arrangement, Accelerated Cost     10,900                  
Unsecured Debt | Payroll Support Program Loan CARES Act [Member]                        
Unusual or Infrequent Item, or Both [Line Items]                        
Proceeds From Payroll Support Program, Low-Interest Loan   $ 24,700                    
Payroll Support Program2                        
Unusual or Infrequent Item, or Both [Line Items]                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares             179.23          
Allegiant Air                        
Unusual or Infrequent Item, or Both [Line Items]                        
Operating Special Charge     13,453 141,713                
Non-Operating Special Charge     0 0                
Special Charges, Total     13,453 141,713                
Sunseeker Resorts                        
Unusual or Infrequent Item, or Both [Line Items]                        
Operating Special Charge     0 137,994                
Non-Operating Special Charge     0 26,632                
Special Charges, Total     0 164,626                
Other                        
Unusual or Infrequent Item, or Both [Line Items]                        
Operating Special Charge     545 26,592                
Non-Operating Special Charge     0 0                
Special Charges, Total     $ 545 26,592                
Asset impairment charges       $ 26,600