<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by speaker:
Someone can correct me on this, but I think YVR has sterile transit (as is so common in Europe). As you are connecting from transborder to int'l, you shouldn't even need to clear canadian customs!</font>
Unless someone who really knows jumps in with a word to the contrary, don't count on it. They didn't use to, and it would take some effort to build the facility to accommodate what is likely seen as a relatively small stream of international transit pax.