They could definitely take a taxi from Montreal to Plattsburgh. It is ~1 hour drive, so I'm not sure how much it would be.
There is also bus service via Greyhound. Check out their site for details. www.greyhound.com
Alternatively they could take a limo. Here is one of the companies in Plattsburgh. http://groundforce1.net/index.htm
Hope this helps.
Many thanks Cammie. Thats a great help to me. Happy New Year!
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