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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2020
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Revenue Recognition [Abstract]        
Contract with Customer, Liability, Forward Bookings     36780000000.00%  
Contract with Customer, Liability, Credit Voucher Bookings     6210000000.00%  
Revenue, Performance Obligation, Description of Timing     12 months  
Air Traffic Liability, Recognized   $ 307.5    
Contract with Customer, Liability, Passenger Revenue     75.10%  
Credit Voucher Term Expiration 2 years      
Points Liability     $ 34.0 $ 15.9