Weren't the AC 744s the combi models, used mainly from YYZ to FRA and LHR?
I remember flying YYC-LHR in the nineties on ancient 747-100s. With Y on the upper deck, while the combi had J in front and upstairs.
I would be surprised if the combi ever operated in the West.
Their web page mentions non-combi 744s, but I suspect these were the CP ones.