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COVID-19 COVID-19 (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jun. 30, 2021
Apr. 23, 2021
Dec. 27, 2020
Dec. 24, 2020
Unusual or Infrequent Item, or Both [Line Items]        
Total Proceeds To Be Provided to U.S. Airlines From Payroll Support Program Extension     $ 15,000,000  
Payroll Support Program Grant Extension        
Unusual or Infrequent Item, or Both [Line Items]        
Total Proceeds from Payroll Support Program Grant $ 91,800      
Additional Proceeds Received from Payroll Support Program   $ 13,800    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   924    
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 179.23
Debt Instrument, Face Amount   $ 1,700    
Payroll Support Program 3        
Unusual or Infrequent Item, or Both [Line Items]        
Total Proceeds from Payroll Support Program Grant $ 98,400