Originally Posted by
Palal
If you buy a YYZ-WAS-YYZ trip that's not cabotage that's a round trip. Here the OP's buying YOW-DCA-YVR, which is an open jaw. That's legal as it's 2 piecees of one-way fares. If the airline offedred YOW-DCA-YVR as a single fare it would be illegal.
The OP's trip is not an open jaw. It's a one-way trip with two stops. Perhaps it really is two one-way fares pushed together in a way that is transparent to the buyer.