In an effort to attract more Canadian travelers, Plattsburgh International Airport will use federal subsidies to fly larger planes to Boston, according to a story in the Burlington Free Press. The upgrade presents competition to Burlington International Airport, which currently does not offer direct service to Boston. Colgan Air, Inc plans to fly 34-passenger turboprop planes between Plattsburgh and Boston up to three times daily. Currently, Plattsburgh’s service to Boston is through Cape Air, which covers the route using nine-passenger aircraft. $2.1 million yearly in subsidies provided by the Essential Air Service program will pay for the new service.In addition to Canadian customers, who currently represent about 85 percent of those flying out of Plattsburgh, the airport hopes to attract more Vermonters with the new service. Burlington has not offered direct flights to Boston since the beginning of 2008, when Big Sky Airlines, a subsidiary of Delta, cancelled the route.