The problem is that its across an international border from the Montreal airport. So you'd need to cross a border twice to fly to a domestic US destination and twice more on your return. Crossing a border is always an unknown in terms of delays, so I question the practicality. I'd personally feel like I needed to leave way more than 90 minutes to ge to the airport.
FWIW, I've crossed the border at both Cornwall and Ogdensburg when driving to Ottawa, and they were quiet when I crossed. Going from the US side to Canada was fast and easy, but the reverse wasn't true, and that was several years ago when crossing the border was quite a bit less stressful.
FWIW, I've crossed the border at both Cornwall and Ogdensburg when driving to Ottawa, and they were quiet when I crossed. Going from the US side to Canada was fast and easy, but the reverse wasn't true, and that was several years ago when crossing the border was quite a bit less stressful.