Thanks to everyone for their input on this subject. It's raised my curiosity as I'll be arriving on CX from HKG at around 9:25 p.m. and transferring to an AC flight to YYZ. I'll have NEXUS, a mobile boarding pass, and only carry on bags for the one hour 50 minute connection. Would I be able to, and should I try to use Quick Connect or just use NEXUS and re-enter security for the domestic flight...?
This will be my first time transferring like this at YVR as I usually transfer at YYZ which I can practically do in my sleep now, even though I'm usually going from T3 to T1.