Originally Posted by flytastic

Mileage run. I fly from the (same city) US to YVR, arrive at 10AM and then at 11AM board the same plane and fly back to the (same city) US. Mileage run. No luggage. No laptop. Just phone + charger + headphones. US Citizen. US Passport. Global Entry card. US driver license.

Can't I just stay at the gate? Do I have to do what this link says?

https://www.aircanada.com/us/en/aco/...t/int-int.html
Connecting through Vancouver - Between two International Flights
Follow overhead signs “Welcome to Vancouver” and Canada Customs.
Proceed down escalator into Canada Customs.
Have all documentation in hand and ensure all applicable forms have been completed.
Follow Connections to International and enter the International Connection line.
Clear Canada Customs. Take elevator to Departures Level 3 to your next flight.