King Salmon Airport (IATA: AKN, ICAO: PAKN, FAA LID: AKN) is a state owned, public use airport located just southeast of King Salmon, in the Bristol Bay Borough of the U.S. state of Alaska.
 It was formerly the Naknek Air Force Base, named for its location near the Naknek River.
Chignik Lagoon Airport (IATA: KCL, FAA LID: KCL) is a state-owned, public-use airport serving Chignik Lagoon, in the Lake and Peninsula Borough of the U.S. state of Alaska.
 It is also known as Chignik Flats Airport.
 Scheduled airline service to King Salmon Airport is provided by Peninsula Airways (PenAir).
The King Salmon River is a 35 mi tributary of the Ugashik River in the U.S. state of Alaska.
 Beginning at Mother Goose Lake in the Aleutian Range, it flows northwest to meet the larger river near the upper reaches of Ugashik Bay.
 The lake and the upper course of the King Salmon lie within the Alaska Peninsula National Wildlife Refuge.
 The river's gravel bottom and braided channels are ideal for the many king salmon that spawn in its waters, but they limit navigation to small skiff.
Pilot Point Airport (IATA: PIP, ICAO: PAPN, FAA LID: PNP) is a state-owned, public-use airport located in Pilot Point, a city in the Lake and Peninsula Borough of the U.S. state of Alaska.
 Scheduled airline service to King Salmon Airport is provided by Peninsula Airways (PenAir).
Westerly State Airport (IATA: KWST, ICAO: WST) is a public use airport in Washington County, Rhode Island, United States.
 It serves the town of Westerly and is located two nautical miles (4 km) southeast of its central business district.
 It is primarily a general aviation airport, but there is also scheduled airline service to Block Island provided by New England Airlines.
Block Island State Airport (IATA: KBID, ICAO: BID) is a public use airport located on Block Island, in Washington County, Rhode Island, United States.
 The airport is owned by the State of Rhode Island.
 It is primarily a general aviation airport, but there is also scheduled airline service to Westerly State Airport.
 The airport opened in 1950.
Perryville Airport (IATA: KPV, ICAO: PAPE) is a state-owned, public-use airport located one nautical mile (1.85 km) southwest of the central business district of Perryville, in the Lake and Peninsula Borough of the U.S. state of Alaska.
 Scheduled airline service to King Salmon Airport is provided by Peninsula Airways (PenAir).
Igiugig Airport (IATA: IGG, ICAO: PAIG, FAA LID: IGG) is a state-owned, public-use airport serving Igiugig, in the Lake and Peninsula Borough of the U.S. state of Alaska.
 Scheduled airline service to King Salmon Airport is provided by Peninsula Airways (PenAir).
Port Heiden Airport (IATA: PTH, ICAO: PAPH, FAA LID: PTH) is a state owned, public use airport located six nautical miles (7 mi, 11 km) northeast of the central business district of Port Heiden, in the Lake and Peninsula Borough of the U.S. state of Alaska.
 Scheduled airline service to King Salmon Airport is provided by Peninsula Airways (PenAir).
Naknek Air Force Base is a former United States Air Force base located just southeast of King Salmon, in the Bristol Bay Borough of the U.S. state of Alaska.
 Following its closure, it has since been redeveloped into King Salmon Airport.

Question: What do King Salmon Airport and Westerly State Airport have in common?
Answer: public use airport