Originally Posted by
bocastephen
Which airline(s)/terminal? That can make a difference, but make sure you *carefully* follow the posted signs for outbound international connections - do not enter arrivals and make absolutely certain the agents at your origin city check your bags, if any, through to your final destination.
Preferred flight would be:
Air Canada - DFW to YYZ to FRA all on Air Canada planes.
other option is thru YUL but that has 4-5 hr layover so not worried about time on that one.