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Description of the business and summary of material accounting policy information- Aircraft, rotable spare parts, furniture and equipment, net (Details)
$ in Thousands
 12 Months Ended
Dec. 22, 2022
USD ($)
Dec. 31, 2023
USD ($)
aircraft
agreement
Dec. 31, 2022
USD ($)
agreement
aircraft
Dec. 31, 2021
USD ($)
Aircraft, rotable spare parts, furniture and equipment, net        
Maintenance deposits expensed as supplemental rent   $ 83,528 $ 48,172 $ 38,227
Number of aircraft added to fleet | aircraft   13 18  
Number of aircraft with lease term extended | aircraft   9 5  
Number of engine agreements for which lease term extended | agreement   6 2  
Maintenance deposits expensed to contingent rent prior to lease extensions   $ 0    
Length of time before routine aircraft and engine maintenance is required   24 months    
Maximum length of time before routine aircraft and engine maintenance   36 months    
Length of time before major aircraft and engine maintenance is required   6 years    
Depreciation   $ 127,401 $ 90,790 50,297
Capitalized borrowing costs   $ 21,901 $ 7,915 7,098
Rate used to determine amount of borrowing cost   8.85% 5.34%  
Airframe sale and purchase agreement with SETNA IO LLC, total amount of the transaction $ 901      
Carrying amount of the remaining owned aircraft     $ 795  
Aircraft leases        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 10,321 5,182  
Constructions and improvements        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   493 607  
Computer equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 76 95  
Annual depreciation rate   25.00%    
Workshop Tools        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 57 55  
Annual depreciation rate   33.30%    
Electric power equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 50 51  
Annual depreciation rate   10.00%    
Communications equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 46 38  
Annual depreciation rate   10.00%    
Workshop machinery and equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 133 110  
Annual depreciation rate   10.00%    
Motorized transport equipment platform.        
Aircraft, rotable spare parts, furniture and equipment, net        
Annual depreciation rate   25.00%    
Service carts on board        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 48 37  
Annual depreciation rate   20.00%    
Office furniture and equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Depreciation   $ 253 232  
Annual depreciation rate   10.00%    
Leasehold improvements to flight equipment        
Aircraft, rotable spare parts, furniture and equipment, net        
Additions   $ 139,830 138,811 85,940
Amortization of major maintenance leasehold improvement   114,924 83,071 $ 40,744
Depreciation   $ 115,764 $ 84,228  
Minimum        
Aircraft, rotable spare parts, furniture and equipment, net        
Duration of routine aircraft and engine maintenance   6 days    
Minimum | Aircraft leases        
Aircraft, rotable spare parts, furniture and equipment, net        
Annual depreciation rate   4.00%    
Maximum        
Aircraft, rotable spare parts, furniture and equipment, net        
Duration of routine aircraft and engine maintenance   12 days    
Duration of major aircraft and engine maintenance   42 days    
Maximum | Aircraft leases        
Aircraft, rotable spare parts, furniture and equipment, net        
Annual depreciation rate   16.70%