Not a source I usually turn to, so I don't know how accurate they are. However it looks like AirTransat is dropping their routes to the US to focus on overseas destinations. Good move, I don't think there are a lot of Canadians looking to vacation in the US these days.
https://www.travelweekly.com/Travel-News/Airline-News/Air-Transat-to-stop-flights-to-US?ct=