Originally Posted by
Jebby_ca
it depends on your departure airport if you go through security. At YVR, they look for the OSS designation on your connecting boarding pass to determine if you need to go through security again after the CBSA check. At least that's the way it worked the last time I did an INTL - INTL transit at YVR last year.
My understanding was that ITI did not require security, and ITD might, depending on your origin.
Originally Posted by
RangerNS
An US->INTL PAX could easily, if fraudulently, transit that path without either customs or security controls, e.g. with an easily constructed electronic BP screenshot.
I did that in February. Not intentionally. They just let me through. No CBSA. No passport. No look at my inbound boarding pass. They only cared I was going to MUC.