Originally Posted by YVR Cockroach

1) Might be a depends. Pax on the flight might have to clear into Canada (might be the best option), or can do a brief clearance and go straight to U.S. pre-clearance. Not sure if the latter requires security screening..

2) I think it it is the latter, which may be not *too* bad (don't have to wait for bags, and there's a baggage drop off after exiting customs)