Watertown International Airport is a county owned, public use airport located in Jefferson County, New York, United States. It is located five nautical miles (6 mi, 9 km) west of the central business district of Watertown. The airport is mostly used for general aviation, but has scheduled passenger service provided by one commercial airline and subsidized by the Essential Air Service program. The airport does not provide any scheduled international passenger flights, but is available as an international port of entry for private aircraft on two hours advance notice to customs from pilots.As per the Federal Aviation Administration, this airport had 2,203 passenger boardings (enplanements) in calendar year 2010, 4,449 in 2011, and 16,988 in 2012. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a non-hub primary commercial service facility.Facilities and aircraftThe Watertown International Airport covers an area of 1,060acre at an elevation of 330ft above mean sea level. It has two asphalt paved runways: 10/28 is 7,001 by 150 feet (2,134 x 46 m) and 7/25 is 4,999 by 150 feet (1,524 x 46 m). Runway 10/28 was extended from 5,000 feet length to 5,999 feet as an interim extension and was lengthened again to 7,001 feet opening to that length in July 2016. The airport is equipped with an instrument landing system and a medium intensity approach lighting system with runway alignment indicator lights on the shorter runway 7.
