Originally Posted by exAC

This type of availability has a name that I have trouble remembering, but it is something like 'short-haul-stop-sale'. It has been going on for years and the only thing that surprised me was that I didn't think that Res3 was capable in doing this when it first arrived at AC. Basically the system is set up to allow people to buy through tickets on segments that are closed for short-hauls traffic as the flights that is blocked YYT-YYZ is probably the only one that connects to PHL.