Originally Posted by tracon

Most if not all DXB-California flights pass over B.C. on a north-south flight plan.
Eastbound flights will take a variety of routes depending on the jetstream. Some will pass over B.C., others fly over Manitoba and/or Ontario etc....
Go to flightaware.com and enter UAE215/225/216/226

As for using YYZ as a hub, I suspect the emirati of WS would provide code-shared connecting flights.