I vaguely remember something about that restriction too. Prior to making my last post I actually checked the ONE Explorer rules and US-Canada-US transit restriction, if it exists, is NOT specific to xONEx. Now that doesn't mean this restriction does not apply to the OP, as it may well be pertinent.

I am sure when the OP tries to build this in the online tool and/or ticket with AA RTW desk that they will be fully aware of this restriction if it applies to the OP's desired itinerary and let him know accordingly.

Jonnny, while FT is a great place to get started, you really have gotten to a point where it might be best to contact the AA RTW desk and build you itinerary. Details like this will be weeded out in the process and you would have a definitive answer. That way you can put it on hold, mull it over and call back and make changes as needed.

The worse case scenario is you have to overnight in YVR, which IMO would not be bad thing as it is an awesome city.