Too bad.
Flying to the U.S. out of YOW, I am no longer willing to transfer at YYZ, because it involves re-lining up for bags, customs and security. I now take whatever flight is required to clear bags, customs and security only once at Yow. Since there are very few AC flights direct to the U.S. from YOW, I am now flying Westjet or U.S. airlines instead. I now get there & back faster, with less hassle, and usually at less cost.
Cheers,