I am planning a flight direct from UK to Seattle without stopping off in Vancouver (I will stop in Vancouver after visiting the US). I get conflicting messages from TA forum and YVR airport website: Do I have to go through any Canadian immigration or customs formalities? Or can I by-pass these queues by going direct from my incoming flight from London straight through to US customs and security controls? I need to know how much time to allow between flights.
(Sorry for cross-posting with BC forum - but I do need an answer!)