1) AC flies LHR ex-YHZ, however daytime flight ex-YHZ (arrival 8:30 pm) and early morning (9:00 am) departure ex-LHR make this route exclusively point-to-point traffic. AC wishes to give travellers out of Nova Scotia the possibility to make a one-stop-connection thru an European gateway. As they won’t have enough A321XLR’s by June, B737M’s will be used. First Star Alliance hub on the map from Atlantic Canada is BRU - et voilà!
2) Secondly, AC feels pressure from WestJet flying to AMS and CDG ex-YHZ where they have code-share agreements with AF-KL. AC wishes to keep up with their competitor before sufficient amount of A321XLR’s can be based in YHZ (AC plans to fully transition their B737M’s to Air Canada Rouge).
Not sure if the Halifax-Brussels route will remain for S27 - for now (S26) AC might just fill/use in the gap before the deliveries of A321XLR’s are in full swing.