I'm a bit concerned about this as well as I'm flying next week DCA-YUL-YHZ with a 1 hour 16 minute connection time. What bugs me is that when transfering from an international flight to a domestic connection at YUL you have to clear immmigration and customs, re-check your bags, and then go through security again. My YUL-YHZ flight is the last one of the day, and I'm wondering what AC's responsibility is if I get hung up in a huge (domestic) security line?