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REVENUE - Contract Balances (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 13, 2019
Dec. 31, 2019
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
REVENUE                
Maintenance expense     $ 11,018 $ 9,660 $ 35,794 $ 30,170    
Total Contract Liabilities     152,648   $ 152,648   $ 142,480  
Amazon Agreement                
REVENUE                
Warrants vested (in shares) 632,183       568,956 568,956    
Air Traffic Liabilities                
REVENUE                
Total Contract Liabilities     132,830   $ 132,830   118,562  
Loyalty Program Liabilities                
REVENUE                
Revenue recognized         8,526 $ 4,816    
Total Contract Liabilities     16,317 20,311 16,317 20,311 19,718 $ 22,069
Amazon Deferred Up-front Payment                
REVENUE                
Proceeds from startup costs   $ 10,300            
Fair value of warrants vested   4,667            
Total Contract Liabilities     3,501   $ 3,501   4,200  
Amazon Deferred Up-front Payment | Other Liabilities                
REVENUE                
Fair value of warrants vested   $ 5,633            
Costs to fulfill contract with Amazon                
REVENUE                
Amortization period         6 years      
Maintenance expense     151 208 $ 469 515    
Contract Assets     2,350   2,350   $ 2,819  
Cargo | Amazon Deferred Up-front Payment                
REVENUE                
Revenue recognized     $ 225 $ 310 699 $ 779    
Passenger                
REVENUE                
Revenue recognized         $ 109,852