Question: Martha's Vineyard Airport and Erie International Airport, are which class of airport?
Sentence (from "Martha's Vineyard Airport"): Martha's Vineyard Airport (IATA: MVY, ICAO: KMVY, FAA LID: MVY) is a public airport located in the middle of the island of Martha's Vineyard, three miles (5 km) south of the central business district of Vineyard Haven, in Dukes County, Massachusetts, United States.
Relevant evidence: Yes