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REVENUE - Contract Balances (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Dec. 13, 2019
Dec. 31, 2019
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
REVENUE            
Maintenance expense     $ 11,995 $ 9,210    
Total Contract Liabilities     $ 132,279   $ 142,480  
Amazon Agreement            
REVENUE            
Warrants vested (in shares) 632,183   189,652 189,652    
Air Traffic Liabilities            
REVENUE            
Total Contract Liabilities     $ 110,946   118,562  
Loyalty Program Liabilities            
REVENUE            
Total Contract Liabilities     17,374 $ 20,774 19,718 $ 22,069
Revenue recognized     4,163 2,152    
Amazon Deferred Up-front Payment            
REVENUE            
Total Contract Liabilities     $ 3,959   4,200  
Proceeds from startup costs   $ 10,300        
Fair value of warrants vested   4,667        
Amazon Deferred Up-front Payment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-01            
REVENUE            
Amortization period     6 years      
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     $ 161 138    
Contract Assets     2,658   $ 2,819  
Passenger            
REVENUE            
Revenue recognized     87,982      
Cargo | Amazon Deferred Up-front Payment            
REVENUE            
Revenue recognized     $ 240 $ 231