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Financial assets and liabilities - Aircraft financing (Details) - aircraft
12 Months Ended
Nov. 28, 2018
Nov. 30, 2016
Aug. 25, 2015
Nov. 27, 2014
Feb. 28, 2014
Aug. 01, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Aircraft financing                    
Number of aircraft incorporated to fleet             10 5 17  
Revolving line of credit                    
Aircraft financing                    
Number of aircraft financed   22 8 4 2 8 1      
Number of aircraft delivered                 5 1
Number of aircraft incorporated to fleet               1    
Number of aircraft with rescheduled delivery dates 26 22 7