Petersburg James A. Johnson Airport and Nantucket Memorial Airport, are which specific type of airport?
Petersburg James A. Johnson Airport: Petersburg James A. Johnson Airport (IATA: PSG, ICAO: PAPG, FAA LID: PSG) is a state owned, public use airport located one nautical mile (2 km) southeast of the central business district of Petersburg, a city in the Petersburg Census Area of the U.S. state of Alaska which has no road access to the outside world.
i don't know