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Revenue Recognition - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2020
Sep. 30, 2020
USD ($)
Mar. 31, 2020
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
lineOfBusiness
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]              
Number of lines of business | lineOfBusiness         1    
Number of segments | segment         1    
Operating revenue   $ 75,982   $ 755,151 $ 695,130 $ 2,124,091  
Revenue, performance obligation, timing         represents revenue that is expected to be realized over the next 12 months    
Ticket validity period 24 months   1 year        
Passenger revenue, excluding frequent flyer              
Disaggregation of Revenue [Line Items]              
Operating revenue   34,623   653,424 $ 534,926 1,834,853  
Air traffic liability   305,700     305,700   $ 426,900
Air traffic revenue recognized   6,400   367,500 254,600 422,100  
Frequent flyer revenue, transportation component              
Disaggregation of Revenue [Line Items]              
Operating revenue   5,154   $ 40,839 38,082 $ 114,137  
Air traffic liability   $ 389,600     $ 389,600   $ 349,800
North America | Geographic concentration risk | Domestic revenue benchmark              
Disaggregation of Revenue [Line Items]              
Concentration risk, percentage   49.00%   73.00%