Premise: Porter County Regional Airport (IATA: VPZ, ICAO: KVPZ, FAA LID: VPZ) (formerly Porter County Municipal Airport) is a public use airport located one nautical mile (1.8 km) southeast of the central business district of Valparaiso, a city in Porter County, Indiana, United States. It is owned by the Porter County Municipal Airport Authority.
Hypothesis: Porter County Regional Airport has many call signs.