FYI: I flew into YYZ yesterday and purchased my AONE3 ex-ICN that commences March 1, 2010. As such all but the first segments are open dated and a paper ticket was issued. I learned from the YYZ Airport AA Ticket Agent that they always have problems when ticketing ATW tickets, and mine was no exception. As such she spent about 10-15 minutes on the phone with the AA ATW desk. Patience paid off and the ticket was issued successfully. So if anyone is going to Canada to purchase their ATW ticket, keep in mind that you will want to do it when the ATW desk is open for consultation.
AONE3 price ended up being about $6215.12 plus $422.06 taxes and fees (estimated USD at current FX rate plus 3% Visa FX fee).