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Unusual or Infrequently Occurring Items (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 60 Months Ended
Apr. 20, 2020
$ / shares
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Aircraft
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 30, 2025
Dec. 27, 2020
USD ($)
Unusual or Infrequent Item, or Both [Line Items]                  
Proceeds from Government Assistance, Payroll Support Program, CARES Act     $ 176,900,000            
Proceeds From Payroll Support Program, Low-Interest Loan     $ 23,100,000            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares     27,681            
Debt Instrument, Term 10 years                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 83.33                
Total Proceeds To Be Provided to U.S. Airlines From Payroll Support Program Extension                 $ 15,000,000,000.0
Operating Special Charge, Total         $ 306,299,000        
Non-Operating Special Charge, Total         26,632,000        
Special Charges, Total         332,931,000        
Special charges         161,600,000 $ 0 $ 0    
Other Aircraft Related Costs         $ 98,000,000.0        
Number of Aircraft Retired | Aircraft         8        
Number of Engines Retired | Aircraft         5        
Number of Aircraft In Sale-Leaseback Transactions | Aircraft         8        
Postemployment Benefits, Period Expense         $ 35,100,000        
Termination Loans       $ 19,800,000 19,800,000        
Other Expenses         $ 6,600,000        
Proceeds Received From Payroll Support Program     $ 153,800,000            
Fair Value of Common Stock Called by Warrants     1,400,000            
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     $ 23,100,000            
Subsequent Event | Unsecured Debt | Payroll Support Program Loan CARES Act [Member]                  
Unusual or Infrequent Item, or Both [Line Items]                  
Debt Instrument, Interest Rate Terms               five years  
COVID19 [Member]                  
Unusual or Infrequent Item, or Both [Line Items]                  
Unusual Or Infrequent Item, Reduction Of Salary       50.00% 50.00%        
Allegiant Air                  
Unusual or Infrequent Item, or Both [Line Items]                  
Operating Special Charge         $ 141,713,000        
Non-Operating Special Charge         0        
Special Charges, Total         141,713,000        
Special charges         5,000,000.0        
Postemployment Benefits, Period Expense         32,100,000        
Sunseeker Resorts                  
Unusual or Infrequent Item, or Both [Line Items]                  
Operating Special Charge         137,994,000        
Non-Operating Special Charge         26,632,000        
Special Charges, Total         164,626,000        
Special charges   $ 128,900,000   $ 0          
Postemployment Benefits, Period Expense         2,900,000        
Construction Suspension Expense         5,000,000.0        
Other                  
Unusual or Infrequent Item, or Both [Line Items]                  
Operating Special Charge         26,592,000        
Non-Operating Special Charge         0        
Special Charges, Total         26,592,000        
Special charges         $ 26,600,000        
Kingsway Golf                  
Unusual or Infrequent Item, or Both [Line Items]                  
Special charges   $ 1,100,000