If you're interlining on the way back, as you both are, don't forget NOT to buy duty free at the airport! You will clear Canadian Customs in Montreal (or your first point of entry into Canada), claim your bags, and you will need to pack your booze in your checked luggage. Or at least leave space and weight room for it! You will then go through for you connectingflight, and you will need to go through security again, and .... oooops! Your precious duty free rum creme is now a forbidden "liquid". We have had to interline through Toronto several times, and it's a pain in the behind! Get your duty free allotment in Negril, and pack it with all your other stuff. (careful with any appleton liquers - coffee rum, banana rum etc, as they tend to leak. So wrap them well or your underwear will smell like a distillery!