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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Discounts and incentives $ 1,600 $ 3,200  
Revenue 351,812 325,635  
Capitalized sales commission and referral fees 1,600 4,300  
Amortization expense 3,700 3,500  
Other | Whole Aircraft Sales      
Disaggregation of Revenue [Line Items]      
Revenue 10,700 $ 1,100  
Other | Group Charter      
Disaggregation of Revenue [Line Items]      
Revenue 6,400    
Other | Safety and Security      
Disaggregation of Revenue [Line Items]      
Revenue 5,900    
Prepaid expenses      
Disaggregation of Revenue [Line Items]      
Capitalized contract cost, net 6,700   $ 8,700
Other current assets      
Disaggregation of Revenue [Line Items]      
Capitalized contract cost, net $ 1,100   $ 1,300