If that airport is GOT, I can't imagine AC would have ticketing there. Neither can I imagine another airline issuing a ticket bought with AC.

There have been similar issues in the past with Aeroplan tickets. Given that Aeroplan folks are in the habit of booking but forgetting to actually issue them, which as long as it's on AC, ends up working (but with people cursing them at check in). But leads to big trouble in foreign lands and airlines.