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Description of the business and summary of significant accounting policies - Aircraft, rotable spare parts, furniture and equipment, net (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 22, 2022
USD ($)
Oct. 31, 2021
engine
Feb. 28, 2021
engine
Dec. 31, 2022
USD ($)
agreement
aircraft
Dec. 31, 2021
engine
Dec. 31, 2021
USD ($)
Dec. 31, 2021
aircraft
Dec. 31, 2021
agreement
Dec. 31, 2021
Dec. 31, 2020
USD ($)
Aircraft, rotable spare parts, furniture and equipment, net                    
Maintenance deposits expensed as supplemental rent       $ 48,172   $ 38,227       $ 20,063
Number of aircraft added to fleet | aircraft       18     15      
Number of aircraft with lease term extended   1 2 5 3   15      
Number of engine agreements for which lease term extended | agreement       2       3    
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       $ 90,790   50,297       37,383
Capitalized borrowing costs       $ 7,915   7,098       17,872
Rate used to determine amount of borrowing cost       5.34%         2.76%  
Impairment charges on rotable spare parts, furniture and equipment       $ 0   0       0
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       5,182   5,790        
Constructions and improvements                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Depreciation       607   800        
Computer equipment                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Depreciation       $ 95   277        
Annual depreciation rate       25.00%            
Workshop tools                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Depreciation       $ 55   178        
Annual depreciation rate       33.30%            
Electric power equipment                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Depreciation       $ 51   62        
Annual depreciation rate       10.00%            
Communications equipment                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Depreciation       $ 38   50        
Annual depreciation rate       10.00%            
Workshop machinery and equipment                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Depreciation       $ 110   95        
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       $ 37   38        
Annual depreciation rate       20.00%            
Office furniture and equipment                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Depreciation       $ 232   274        
Annual depreciation rate       10.00%            
Leasehold improvements to flight equipment                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Additions       $ 138,811   85,940        
Amortization of major maintenance leasehold improvement       83,071   40,744       $ 30,555
Depreciation       $ 84,228   $ 42,618        
Minimum                    
Aircraft, rotable spare parts, furniture and equipment, net                    
Duration of routine aircraft and engine maintenance       7 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%