Yep. So on YYC-YYZ the route is charging Signature-premium of ~300 embedded in the fare. On YVR-YYZ such a premium is being charged seperately. It isn't a lie-flat premium, but a Signature premium and this isn't Signature. I'm booked on one, and will in the middle 2, for aisle access. No window this time, because the windows don't have aisle access. That's a specific attribute of Signature, and on these birds it is missing.

I tried to point out to AC this might not go over well with passengers. My travel will be on an AP ticket, which makes no Signature promise so I'm going in eyes wide open and am sure I will enjoy the plane. I just think AC should avoid muddling up Signature they worked so hard to build.