Chris L. Not sure which taxes you are referring to that are 10%. International travel is USD 12.50 for departure and same for arrival. There are also customs, immigration and aphis fees that are USD 6/5/3 respectively.

For travel within the USA and the 250 mile buffer zone in Canada and Mexico, the US tax is 7.5%. If you were to buy a ticket YVR-YYZ in the US, you would pay the 7% GST and the 7.5% US domestic tax. If the same ticket is purchased in Canada, you only pay the GST.

There are times it is advantagous to have tickets issued in one country or the other, but it also depends on your point of departure as well.

As for ChrisMoss, what kind of ticket are you looking for? Are you just wanting to purchase a domestic or international ticket, and what type of itinerary? If it is a Oneworld RTW, and your origin was the same no matter where you purchased it, it would make no difference. If you are wanting to start in a different country, then usually SEL/BKK or India are best. Won't be back to work until later this week, but will gladly check for you.