Searching for PIT-PVG one-way or round-trip flight for August / September. The AC 8035 / 87 option (connecting in YYZ) never appears at aircanada.com US edition, even when searching for flexible econ or executive class fares.

Also tried PHL-PVG or EWR-PVG at aircanada.com: still the same problem, as if the YYZ-PVG direct flight AC 87/88 never "existed".

However, I can successfully book the two segments separately (i.e. PIT-YYZ, YYZ-PVG by searching for multi-city flight), though there is an error message for the YYZ-PVG segment: “Flights you requested are not available. Alternate departure dates have been provided. (7252)”. Actually, the flight is available on that day, and I can simply ignore the error message to go on with the booking.

Quite weird…

At Expedia.com, no problem occurs with the booking.