Originally Posted by FlyerGoldII

Yes, that web site is very helpful.

But I do have some questions not answered by the web site.

The AC concierge suggests I do see a Canadian customs and immigration agent - nothing in the web site to suggest that.

Nothing in the web site to suggest I go to the main Canadian customs hall.

Nothing to suggest I will get OSS - and even if I do, probably no impact on process coming from international arrivals to US departures.

Of course, with the semi-airside way to connect to US preclearance - no nexus available for security; nexus is available for US customs process.