One itinerary. I am flying from Sea to yyz on Alaska and from yyz to lhr on BA with terminal 3 transfer. Is there a passport or Canada immigration required and then being dumped outside sterile area to be re-screened again.
I hope us to internarional connections at terminal 3 don't require entering Canada. Yyz connections guide talks about cleaning Canada immigration in this case at terminal al 3.
any other info thanks