primarily on the upper reaches of the volcanoes. Adak has an average of 341 days per year with measurable precipitation. Education Adak is served by the Aleutian Region Schools. The Adak School serves grades K–12 and has around 20 students. Economy A land exchange between Alaska Native Regional Corporations, the U.S. Navy, and the Department of the Interior has transferred most of the naval facilities to the Aleut Corp. A portion of the Island will remain within the National Maritime National Wildlife Refuge, managed by U.S. Fish and Wildlife. Adak currently provides a fueling port and crew transfer facility for foreign fishing fleets—an airport, docks, housing facilities and food services are available. A grocery and ship supply store and restaurant opened in February 1999. Aleut Corporation maintains the facilities. Contractors are performing an environmental clean-up. Alaskan-owned Norquest-Adak Seafood Co. processes Pacific cod, pollock, mackerel, halibut, albacore and brown king crab. Four residents hold a commercial fishing permit, primarily for groundfish. In 2022 Netflix aired a docuseries about explorers seeking pirate gold on the island Transportation Because of its naval aviation past, Adak has an unusually large and sophisticated airport for the Aleutian Islands. The Adak Airport is currently operated by the State of Alaska Department of Transportation. Adak Airport has a control tower, an Instrument Landing System and two runways; and respectively. Both runways are asphalt paved, wide and at an elevation of . Alaska Airlines operates twice-weekly Boeing 737-800 passenger and cargo jet service from Anchorage. At present, flights operate each Wednesday and Saturday (weather permitting). Occasionally, extra seasonal flights are operated to meet the demand of the fishing season. The Adak Airport was historically served for many years by Reeve Aleutian Airways (RAA), with scheduled passenger flights to Anchorage operated with Lockheed L-188 Electra turboprop combi aircraft during the 1970s, followed by Boeing 727-100 jet combi aircraft during the 1980s and 1990s. Other facilities in Adak include three deep water docks and fueling facilities. The city has requested funds to greatly expand the Sweeper Cove small boat harbor, including new breakwaters, a 315-foot (96 m) dock and new moorage floats There are approximately of paved and primitive roads on Adak, all privately owned by the Aleut Corporation. Flora The Aleutian shield fern is an endangered species found only on this island. Geology Adagdak and Mount Moffett volcanoes are located on Adak. The igneous rock type adakite is named