YYC lost mainline to ORD sometime "recently". I'm not sure if/when it had mainline to SFO. YYC is now exclusively RJ to ORD and SFO, and half mainline/half RJ to DEN.

Also seeing not just a reduction of capacity, but frequency too . UA(X) used to have more flights out of YYC than all other American carriers combined, but I think this is no longer the case... the UA advantage here is decreasing.