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REVENUE RECOGNITION - Schedule of Deferred Revenue (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]    
Deferred revenue - total $ 702,638 $ 724,229
Less: Deferred revenue - current (702,174) (723,246)
Deferred revenue - non-current 464 983
Flights - Prepaid Blocks    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 673,052 686,413
Memberships - annual dues    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 27,576 33,890
Memberships - initiation fees    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 1,249 2,377
Flights - credits    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 751 1,366
Other    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total $ 10 $ 183