Behaviour can be anti competitive without being collusive or criminal . The minute wj and yyc announced the hub arrangement ( and WestJet yyc flight consolidation in yyc ) ac saw opportunity arising in the form of less competion in its key markets of yyz and yul and vice versa . And it will only get worse for ac elites who fly out of yyc a lot. Only good news for those folks is united seems keen to pick up some of the slack with a bunch of yyc to USA destinations.