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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
 12 Months Ended
Dec. 31, 2020
MXN ($)
agreement
aircraft
Dec. 31, 2019
MXN ($)
agreement
engine
aircraft
Dec. 31, 2018
MXN ($)
agreement
engine
aircraft
Aircraft, rotable spare parts, furniture and equipment, net      
Maintenance deposits expensed as supplemental rent $ 421,030 $ 295,720 $ 299,601
Number of aircraft added to fleet | aircraft 7 7 10
Number of aircraft with lease term extended | agreement 2 1 2
Number of engine agreements for which lease term extended | engine   1 2
Maintenance deposits expensed to contingent rent prior to lease extensions $ 0    
Length of time before routine aircraft and engine maintenance is required 22 months    
Depreciation $ 797,827 $ 587,849 $ 427,756
Capitalized borrowing costs $ 384,038 $ 456,313 $ 357,920
Rate used to determine amount of borrowing cost 3.58% 5.10% 4.41%
Flight equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation $ 73,952 $ 84,888  
Constructions and improvements      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation 16,379 14,721  
Computer equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation $ 7,613 7,074  
Annual depreciation rate 25.00%    
Workshop tools      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation $ 2,374 1,938  
Annual depreciation rate 33.30%    
Electric power equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation $ 1,373 1,084  
Annual depreciation rate 10.00%    
Communications equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation $ 1,095 933  
Annual depreciation rate 10.00%    
Workshop machinery and equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation $ 1,549 1,044  
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 $ 558 278  
Annual depreciation rate 20.00%    
Office furniture and equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Depreciation $ 5,768 5,854  
Annual depreciation rate 10.00%    
Leasehold improvements to flight equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Additions $ 646,219 659,082  
Amortization of major maintenance leasehold improvement 652,091 450,371  
Depreciation 684,633 469,694  
Rotable spare parts, furniture and equipment assets      
Aircraft, rotable spare parts, furniture and equipment, net      
Impairment charges on rotable spare parts, furniture and equipment $ 0 $ 0 $ 0
Minimum      
Aircraft, rotable spare parts, furniture and equipment, net      
Duration of routine aircraft and engine maintenance 7 days    
Length of time before major aircraft and engine maintenance is required 5 years    
Minimum | Flight equipment      
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 14 days    
Duration of major aircraft and engine maintenance 42 days    
Length of time before major aircraft and engine maintenance is required 6 years    
Maximum | Flight equipment      
Aircraft, rotable spare parts, furniture and equipment, net      
Annual depreciation rate 16.70%