Question:  At which airport is this airline headquartered, which provide Rutland–Southern Vermont Regional Airport with commercial service?
Sentence (from "Rutland–Southern Vermont Regional Airport"): Rutland – Southern Vermont Regional Airport (IATA: RUT, ICAO: KRUT, FAA LID: RUT) , is a state-owned, public use airport located five nautical miles (6 mi, 9 km) south of the central business district of Rutland, a city in Rutland County, Vermont, United States.
Relevant evidence: No