I don't think the trans-oceanic flight is relevant; my itinerary doesn't include a trans-oceanic on AA.
What does matter is the sales restriction as follows:

When travel originates in a country for which a specific local currency fares is published and the ticket is sold in another country, the fare will be that published for the country of origin converted to the currency of the
country of sale at the bank selling rate. The resultant fare must not be lower than from the country of sale.
Exception: Not applicable for sales made and/or travel originating in Canada

However, I'm not quite clear exactly what the Canada exception means; does it mean that Canada is the only country where you CAN purchase tix at the fare of any other country? If so, everybody would be flocking to Canada to purchase AONE6s ex-MRU.

Happy Travels