Premise: Donaldson Center Airport (IATA: GDC, ICAO: KGYH, FAA LID: GYH) is a public airport six miles (10 km) south of the central business district of Greenville, a city in Greenville County, South Carolina, United States. It located at the Donaldson Center Industrial Air Park and is owned by the City and County of Greenville.
Hypothesis: Donaldson Center Airport used to be a private airport.