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REVENUE RECOGNITION - Schedule of Deferred Revenue (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]    
Deferred revenue - total $ 977,427 $ 1,076,875
Less: Deferred revenue - current (975,735) (1,075,133)
Deferred revenue - non-current 1,692 1,742
Flights - Prepaid Blocks    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 927,607 1,023,985
Memberships - annual dues    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 41,624 43,970
Memberships - initiation fees    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 3,677 3,899
Flights - credits    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total 2,423 4,246
Other    
Disaggregation of Revenue [Line Items]    
Deferred revenue - total $ 2,096 $ 775