Well, I would argue that this post is OK here, as the OP booked their flights with DL. DL changed their flights to AS, and even tho they were likely notified of the change, they apparently didn't realize it til the TA told them this at the counter. You know, it was probably in tiny print "operated by Alaska Airlines". I believe we have all glossed over the same thing at times.

True, that, the actual IDB beef is with AS and Canadian law.