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Leases - Fleet and spare engines (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2015
engine
Dec. 31, 2020
agreement
engine
aircraft
Dec. 31, 2019
agreement
engine
aircraft
Dec. 31, 2018
agreement
engine
aircraft
Leases        
Number of aircraft leased   85 81  
Number of spare engines leased | engine   18 14  
Number of aircraft incorporated to fleet   7 7 10
Number of aircraft with lease term extended | agreement   2 1 2
Number of spare engines purchased | engine 3      
Airbus purchase agreement        
Leases        
Number of aircraft purchased   7    
Number of aircraft incorporated to fleet   7    
Number of aircraft returned to respective lessors   3    
Sale and Leaseback Transactions        
Leases        
Number of aircraft purchased     7 10
Number of aircrafts purchased directly from lessor     4  
Number of aircraft incorporated to fleet       7
Number of aircraft returned to respective lessors       4
Number of aircraft with lease term extended | engine     1  
Number of aircraft spare engines with lease term extended       2
Number of spare engines returned | engine     2  
Pratt and Whitney purchase agreement (FMP)        
Leases        
Number of NEO spare engines incorporated to fleet | engine   2 2 2
Number of CEO spare engines incorporated to fleet | engine   2 2  
Number of aircraft spare engines to be leased | engine   4 4  
Number of spare engines with lease term extended | engine     1  
A319 Model 132        
Leases        
Number of aircraft leased   3 3  
A319 Model 133        
Leases        
Number of aircraft leased   2 4  
A320 Model 233        
Leases        
Number of aircraft leased   39 39  
A320 Model 232        
Leases        
Number of aircraft leased   1 2  
A320NEO Model 271N        
Leases        
Number of aircraft leased   24 17  
A320NEO Model 271N | Sale and Leaseback Transactions        
Leases        
Number of aircraft purchased     3  
Number of aircraft incorporated to fleet       3
A321 Model 231        
Leases        
Number of aircraft leased   10 10  
A321NEO Model 271N        
Leases        
Number of aircraft leased   6 6  
V2500 Model V2524-A5        
Leases        
Number of spare engines leased | engine   2 2  
V2500 Model V2527M-A5        
Leases        
Number of spare engines leased | engine   3 3  
V2500 Model V2527E-A5        
Leases        
Number of spare engines leased | engine   5 3  
V2500 Model V2527-A5        
Leases        
Number of spare engines leased | engine   2 2  
PW1100 Model PW1127G-JM        
Leases        
Number of spare engines leased | engine   5 3  
PW1100 Model PW1133G-JM engine        
Leases        
Number of spare engines leased | engine   1 1