Another question: I will be arriving at Terminal 1 on AC from YEG and then connecting on AC to the USA, still from T1. I assume I have to go through (US) security again.
So, if I exit security (to go visit the Lost & Found) then when I go back in via the US section I'll be going through the same security anyway and won't have lost much time or caused extra hassle.
Is this correct?

thank you