During the October YUL-YVR-YUL work+familia trip, priority tagging worked in our favour at both YUl and YVR. Our six bags (pretty lite for a family of five came out within the first seven bags. So it works with AC in Canada. Earlier trips in Z to Asia inter-line were mixed -YYZ-HKG(CX)KUL, bag came out with the unwashed masses, while YVR-HKG(BR)TPE, bag came out within the first ten bags. Trip to AGP (Malaga, Spain) via MAD in September was a wash as well, bag didn't even come out the right lane It will be interesting to see what happens on the YUL-YYZ-SJO-YYZ-YUL trip later this month.