Originally Posted by
californiadreamin'
You are, in fact, entering Canada either way.
But if you're only staying in Canada for a matter of a few hours, and you're not leaving the secure area, then what is the point of requiring a visa? It's just a waste of personnel time, for them having to process the visa, as well as the traveler's time and money.
Maybe some day more airlines will be added to the exempt list.