I have a ATH-YUL-YYZ flight booked on award latitude fare, I was able to confirm upgrade to business instantly on the ATH-YUL segment, but waitlisted on YUL-YYZ segment. It's on a 787 so I imagine it must be pretty popular. What are the chances my eupgrade request will clear for YUL-YYZ? Also, will this be based on Z, P, or R space?