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Financial instruments and risk management - Maturity analysis for financial liabilities (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments $ 51,995,295  
Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 8,127,093  
Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 43,868,202  
Jet fuel Zero-Cost collars    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 9,657  
Jet fuel Zero-Cost collars | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 9,657  
Lease liabilities    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   $ 47,378,242
Lease liabilities | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   7,159,554
Lease liabilities | Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   40,218,688
Aircraft, engines, land and buildings leases    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 44,130,542  
Aircraft, engines, land and buildings leases | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 6,484,092  
Aircraft, engines, land and buildings leases | Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 37,646,450  
Aircraft, engines, land and buildings leases | Lease liabilities    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   40,517,045
Aircraft, engines, land and buildings leases | Lease liabilities | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   4,720,505
Aircraft, engines, land and buildings leases | Lease liabilities | Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   35,796,540
Aircraft and engine lease return obligation    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 2,504,484  
Aircraft and engine lease return obligation | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 86,801  
Aircraft and engine lease return obligation | Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 2,417,683  
Aircraft and engine lease return obligation | Lease liabilities    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   1,852,688
Aircraft and engine lease return obligation | Lease liabilities | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   383,093
Aircraft and engine lease return obligation | Lease liabilities | Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments   1,469,595
Revolving line of credit    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 3,650,612 3,308,509
Revolving line of credit | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 1,096,543 1,855,956
Revolving line of credit | Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 2,554,069 1,452,553
Short-term working capital facilities    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 200,000 200,000
Short-term working capital facilities | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 200,000 200,000
Asset backed trust notes ("CEBUR"), in Mexican pesos    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 1,500,000 1,500,000
Asset backed trust notes ("CEBUR"), in Mexican pesos | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 250,000  
Asset backed trust notes ("CEBUR"), in Mexican pesos | Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments $ 1,250,000 $ 1,500,000