Question: Are Hilton Head Airport and Mammoth Yosemite Airport both public airports? 
Sentence (from "Hilton Head Airport"): Hilton Head Airport (IATA: HHH, ICAO: KHXD, FAA LID: HXD) is a public use airport located on Hilton Head Island, in Beaufort County, South Carolina, United States.
Relevant evidence: Yes