Connection guide for YYZ and YUL (from Air Canada's in-flight magazine)
 

I took these pictures from my flight today and they serve as an excellent, mostly comprehensive guide for connections, and it seems like YYZ is much less of a hassle:

Edit: I know each airport has guides on their sites but these seem a little easier to figure out (at least to me) and I hope it helps out with some of your questions.

https://cimg1.ibsrv.net/gimg/www.fly...e537790c0c.jpg
YYZ1
https://cimg2.ibsrv.net/gimg/www.fly...0593b4e223.jpg
YYZ2
https://cimg3.ibsrv.net/gimg/www.fly...6c6df37760.jpg
YUL

I took the same pictures on my YUL-YOW flight earlier this month - useful indeed.
Btw YUL.. the tunnel to 17-34 is quite a bit (but flat escalator) and I came in from FRA but "disoriented" and had to go through security again.

Considering that this is more oriented towards YYZ T1 AC along with all YUL arrivals, should this be moved to the Air Canada Forum?

I considered posting this in the Air Canada subforum, but I ultimately didn't know which would be the better subforum and decided to post it here given there were a lot of questions about connections. I thought this was a general connection guide that wasn't specific to Air Canada.