Thanks mpc1.

I am British and will be just passing through on my way to Vegas. Air Canada is coming up as by far the cheapest one stop option to get there in August.

My only concern is a relatively short turnaround time if I have to clear US immigration at Vancouver. Flight lands at 1205 and the connection to Vegas leaves at 1345. Its obviously a valid connection as far as the airline goes....but I wonder what my chances of making it are, and more importantly what the options would be if I miss it!