XML 43 R31.htm IDEA: XBRL DOCUMENT v3.21.1
Revenue Recognition Passenger Revenue (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Apr. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Revenue Recognition [Abstract]      
Contract with Customer, Liability, Forward Bookings   55.50%  
Contract with Customer, Liability, Credit Voucher Bookings   44.50%  
Revenue, Performance Obligation, Description of Timing   12 months  
Contract with Customer, Liability, Current   $ 403,049 $ 307,508
Credit Voucher Term Expiration 2 years    
Air Traffic Liability, Recognized   $ 70,200  
Air Traffic Liability, Current     $ 307,500