Duluth International Airport (IATA: DLH, ICAO: KDLH, FAA LID: DLH) is a city-owned, public-use, joint civil-military airport located five nautical miles (9 km) northwest of the central business district of Duluth, a city in Saint Louis County, Minnesota, United States. It serves the Twin Ports area including Superior, Wisconsin. It is mostly used for general aviation but is also served by three commercial airlines. Overall, it is the third busiest airport in Minnesota, behind Minneapolis–St. Paul International Airport and Rochester International Airport. However, it is the second busiest commercial passenger airport in Minnesota, behind only Minneapolis–St. Paul International Airport.