Originally Posted by
canadiancow
As UA*G, you do not have UC access on purely domestic (US) itineraries.
If every trip is going to be Canada to somewhere, you'll always have access.
But if you ever have a multi-city itinerary (I know a FTer who flew YYZ-LAX // LAX-SFO // SFO-YYZ), you would not have access on the LAX-SFO leg.
YMMV, I have also heard that some UC agents do not consider Canada as international.