Originally Posted by House
Unfortunately you will not have access without buying a day pass. US has negotiated the same opt-out as UA on this issue, in which Canada is considered to be domestic. If you were heading off to the Carribean then it would be a different story, and you would have access.
According to
the US website the Caribbean is excluded as well. The only US flights that would cause you to qualify are the 11 European destinations, or a code-share that leaves the North American continent.