On a related, but seperate note: I was just in YUL for the weekend, and flew YYZ-YUL-YYZ on a CP "L" fare (the lowest I think). On the return, I was on a CP operated 767-300, and as an Elite with AC, the CP agents let me use one of the red CP stickers to upgrade to J class. I think that this was a complete bending of the rules, but very nice never the less!