Hey KenHamer -
Any news on this yet? AA/CP in London knows absolutely nothing. CP Exec Desk is just as dumbfolded. I have a friend checking out with a CP gate agent in YVR.
We 'think' it is okay - especially even the YVR.CA website says that it's okay to transit from US to International. But it doesn't say anything about Int-Int though. I guess the airport thinks no one transits internationally.
Thx again!