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Operating leases (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2015
engine
Dec. 31, 2016
engine
aircraft
Dec. 31, 2018
agreement
engine
aircraft
Dec. 31, 2018
engine
aircraft
Dec. 31, 2018
engine
aircraft
Dec. 31, 2017
agreement
engine
aircraft
Dec. 31, 2017
engine
aircraft
Dec. 31, 2017
engine
aircraft
Dec. 31, 2016
item
engine
aircraft
Dec. 31, 2016
agreement
engine
aircraft
Dec. 31, 2016
engine
aircraft
Dec. 31, 2016
engine
aircraft
Operating leases                        
Number of aircraft leased   69 77 77 77 71 71 71 69 69 69 69
Number of spare engines leased | engine   11 10 10 10 8 8 8 11 11 11 11
Number of aircraft incorporated to fleet         10     5       17
Number of aircraft returned to respective lessors         4     3       4
Number of aircraft with lease term extended     2   2 3   3   2   2
Number of aircraft spare engines with lease term extended         2   2          
Number of aircraft spare engines to be leased | item                 5      
Number of spare engines purchased | engine 3 2                 2  
Airbus purchase agreement                        
Operating leases                        
Number of aircraft incorporated to fleet         3     1       8
Lessor's aircraft order book                        
Operating leases                        
Number of aircraft incorporated to fleet         7     4       9
Pratt and Whitney purchase agreement (FMP)                        
Operating leases                        
Number of NEO spare engines incorporated to fleet | engine       2                
A319 Model 132                        
Operating leases                        
Number of aircraft leased   6 4 4 4 6 6 6 6 6 6 6
A319 Model 133                        
Operating leases                        
Number of aircraft leased   9 4 4 4 6 6 6 9 9 9 9
A320 Model 233                        
Operating leases                        
Number of aircraft leased   39 39 39 39 39 39 39 39 39 39 39
A320 Model 232                        
Operating leases                        
Number of aircraft leased   4 4 4 4 4 4 4 4 4 4 4
A320NEO Model 271N                        
Operating leases                        
Number of aircraft leased   1 12 12 12 6 6 6 1 1 1 1
A321 Model 231                        
Operating leases                        
Number of aircraft leased   10 10 10 10 10 10 10 10 10 10 10
A321NEO Model 271N                        
Operating leases                        
Number of aircraft leased     4 4 4              
V2500 Model V2527M-A5                        
Operating leases                        
Number of spare engines leased | engine   3 3 3 3 3 3 3 3 3 3 3
V2500 Model V2527E-A5                        
Operating leases                        
Number of spare engines leased | engine   4 3 3 3 3 3 3 4 4 4 4
V2500 Model V2527-A5                        
Operating leases                        
Number of spare engines leased | engine   4 2 2 2 2 2 2 4 4 4 4
PW1100 Model PW1127G-JM                        
Operating leases                        
Number of spare engines leased | engine     2 2 2