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MidAmerica St. Louis Airport (IATA: BLV, ICAO: KBLV, FAA LID: BLV) is a public use airport next to Scott Air Force Base. It is 14 nautical miles (16 mi, 26 km) east of the central business district of Belleville and 18 nautical miles (21 mi, 33 km) east of downtown St. Louis in St. Clair County, Illinois, United States. It is the fifth busiest of the 12 commercial airports In Illinois.