The correct plane?
I think the 757 is too big for the Mexico-Vancouver route. Air Canada was planning to use A319's which are small and have the range to offer a daily flight. I don't know if the A320's can make it with a full payload. Thats why I mentioned that if Mexicana makes a stop somewhere in the U.S. then they can make it with an A320. But I think that the whole point in opening a nonstop route is to make it easier for the business travelers to travel quick and conveniently. You can already connect at LAX to Vancouver.
But then again for those who interested flying that route, Japan Airlines offers 747-300 service twice weekly....
Pan Am - The World's Most Experienced Airline.