Originally Posted by
rehoult
Not true. A and D are separate concourses in YYC and you'll need to reclear security.
+1. Need to reclear security.
If you haven't booked yet, then it would make more sense to do the entire trip with one airline. Especially if you have checked baggage. The bags are quite slow to come out at YYC, and rechecking bags can be a pain because of line-ups.