Originally Posted by capedreamer

Thanks everyone. We ended up landing at 8:13pm and then waited for a gate until 8:37pm. I then ran and made it to gate 28 at 8:47pm. Boarding hasn't started yet.

FWIW, after that original response from Concierge, I asked again, and they did end up saying they held a space on AC7773 YUL-YYZ tomorrow and that if I missed my connection to "please call us on the Concierge line letting know that you have a non-exchange space on hold that you would like to exchange in order to get you on your destination in time tomorrow."

Glad this wasn't necessary but still nice to know they would have done something. Thanks for everyone's input!