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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2020
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax   $ 592,604 $ 443,747 $ 1,056,566 $ 700,441
Credit Voucher Term Expiration 2 years        
Scheduled service          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax   297,343 225,613 521,196 357,540
Ancillary air-related charges          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax   283,551 213,445 513,016 334,518
Loyalty redemptions          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax   $ 11,710 $ 4,689 $ 22,354 $ 8,383