Question: Are Hilton Head Airport and Mammoth Yosemite Airport both public airports? 
Sentence (from "Mammoth Yosemite Airport"): Mammoth Yosemite Airport (IATA: MMH, ICAO: KMMH, FAA LID: MMH) is a town-owned public airport seven miles east of Mammoth Lakes, in Mono County, California.
Relevant evidence: Yes