Hancock County–Bar Harbor Airport is a county-owned, public-use airport located in Trenton, Maine, eight nautical miles northwest of the central business district of Bar Harbor, a city in Hancock County, Maine, United States. It serves the residents of Hancock County with commercial and charter aviation services. During the summer months, the airport becomes one of Maine's busiest, with significant private jet operations bringing visitors to the numerous summer colonies in the county, which includes Mount Desert Island. Scheduled passenger airline service is subsidized by the Essential Air Service program.