Originally Posted by
tessy143
The trans-US route from Canada-Canada and vice versa isn't even legally allowed technically which is why airlines don't sell those tickets themselves you could purchase 2 separate legs via their website however you'd have to know what city pairs to look for whereas the OTA's will sometimes display them right to you.
Did you just search NYC-YUL on Expedia and this routing was populated? And it was on a single PNR?
I searched LGA-YUL and that was the cheapest option. It ended up being two separate tickets on AA. As for illegal routings airlines know better than two allow. I' m pretty sure it's changed now for OTA's. What was wrong about this is some unsuspecting passengers would book these fares and could be in trouble in case of IROPs or if an agent decides to not allow them to check in, especially in the case of an OTA putting it on the same PNR.
I still see this on ITA matrix where they show a fare via Canada on a US domestic journey, though usually quite expensive but not always; I remember recently seeing SEA-YVR-HNL on WS offered cheaper than with US cariers.