Originally Posted by rankourabu

Aeroplan has (and always had) access to much more Air Canada inventory than partners. There is actually a contractual number between the two.

This is by no means route specific.

Originally Posted by emcampbe

While award space doesn't change between one partner and a different partner, lots of examples of carriers allotting more space to their home program than to partners. Sounds exactly like what is happening here (with the minor detail that Aeroplan isn't actually run by Air Canada, but for all intents and purposes in this case, its their home program).