Question: The Agderfly AS flight school in Norway utilized which type of twin-turboprop STOL utility aircraft between 1989 and 1992?

full_context: Document 1: Donecle: Donecle is a Toulouse-based aircraft manufacturer which develops autonomous aircraft inspection UAVs. The company offers single UAV or swarm of UAVs to visually inspect airliners with high resolution cameras. The company works with airlines such as Air France Industries-KLM and is one of the players in the field aeronautical maintenance automation.
Document 2: Norwegian Air Shuttle destinations: Norwegian Air Shuttle is a low-cost airline operating from Norway, Sweden, Denmark, Finland, Spain and the United Kingdom. As of December 2012, it operates to 87 airports in 25 countries across three continents, from its operating bases. Norwegian was founded in 1993 as a regional airline to operate routes for Braathens SAFE in Western Norway. It became a domestic, main-haul low-cost carrier from 1 September 2002, when it took into use Boeing 737-300. In 2006, Norwegian Air Shuttle established its first non-Norwegian base at Warsaw Frédéric Chopin Airport in Poland. A year later, Norwegian bought the Swedish low-cost carrier FlyNordic, which was merged into Norwegian a year later.
Document 3: Agderfly: Agderfly AS was a flight school and airline based in Kristiansand, Norway, which operated from 1966 to 2004. Originally based in Froland, since 1969 it operated out of Kristiansand Airport, Kjevik. Agderfly was owned by Ola Rustenberg, who was also chief instructor. From 1989 to 1992 the company was split into three, with one part responsible for scheduled services. It operated two Dornier Do 228 and flew services from Kristiansand to Gothenburg, Billund and Bremen.
Document 4: Sud-Ouest Djinn: The Sud-Ouest S.O.1221 Djinn is a French two-seat light helicopter designed and manufactured by aircraft manufacturer Sud-Ouest, which later became Sud Aviation. It was the first indigenously-developed French helicopter, as well as being one of the first practical European helicopters to be produced. The Djinn was also the first rotorcraft to harness tip-jet propulsion to enter production.
Document 5: Nordic Air: Nordic Air A/S was a Norwegian cargo airline based at Sandefjord Airport, Torp. It operated from 1970 to 1973 with a Douglas DC-4, later replaced with two Lockheed L-188 Electra. The airline was not allowed to fly scheduled routes, and relied on chater flights. The most common transport was fish, from Northern Norway, Iceland and the Faroe Islands. The company was bought and merged into Fred Olsen Air Transport in 1973, after Nordic Air had failed to receive permission for its Nordic Express scheduled flights.
Document 6: Dornier Do 28: The type designation Dornier Do 28 comprises two different twin-engine STOL utility aircraft, manufactured by Dornier Flugzeugbau GmbH.
Document 7: Air Norway: Air Norway AS is a virtual, regional airline with its head office in the town of Brekstad, the administrative centre of the municipality of Ørland, in Sør-Trøndelag county, Norway. It operates seven round trips a week from its hub at Ørland Airport to Oslo Airport, Gardermoen, and a single, weekly round trip from Oslo to Aalborg Airport, Denmark, using a wet leased Fairchild Metro aircraft from North Flying. The airline was established in 2003. Following the bankruptcy of Coast Air in January 2008, the airline stepped in and was serving Fagernes Airport, Leirin with two daily flights to Oslo, and one daily flight to Trondheim, but these were terminated in 2009.
Document 8: ATR 72: The ATR 72 is a twin-engine turboprop, short-haul regional airliner developed and produced in France and Italy by aircraft manufacturer ATR (Aerei da Trasporto Regionale or Avions de transport régional), a joint venture formed by French aerospace company Aérospatiale (now Airbus) and Italian aviation conglomerate Aeritalia (now Leonardo S.p.A.). The number "72" in its name is derived from the aircraft's standard seating configuration in a passenger-carrying configuration, which could seat 72-78 passengers in a single-class arrangement.
Document 9: FlyMe: Fly Me Europe AB, operating as FlyMe, was a low-cost airline based in Gothenburg, Sweden. It operated flights from Gothenburg, Stockholm and Malmö to destinations within Europe. Its main hub was Göteborg Landvetter Airport, with hubs at Malmö Airport and Stockholm-Arlanda Airport. Beginning in April 2006, it widened its destination network and started daily services to European destinations. Majority owner of the business was English Billionaire John Robert Porter and his Norwegian business partner Christen Ager-Hanssen. They also had a majority interest in another airline Global Supply Systems a British all cargo carrier. FlyMe acquired in late 2006 a 25% stake in Global Supply Systems holding company Riverdon ltd with the aim to create a low cost long haul product.
Document 10: Dornier Do 27: The Dornier Do 27 was a German single-engine STOL utility aircraft, manufactured by Dornier GmbH (later DASA Dornier, Fairchild-Dornier). Configuration was a classic high-wing, "tail-dragger" aircraft with fixed landing gear.
Document 11: Dornier Do 228: The Dornier Do 228 is a twin-turboprop STOL utility aircraft, manufactured by Dornier GmbH (later DASA Dornier, Fairchild-Dornier) from 1981 until 1998. In 1983, Hindustan Aeronautics (HAL) bought a production licence and manufactured 125 aircraft. In Oberpfaffenhofen, Germany, 245 were built, and 125 in Kanpur, India. In July 2017, 63 aircraft were in airline service.
Document 12: International Aero Engines: IAE International Aero Engines AG is a Zürich-registered joint venture manufacturing company founded in 1983 to develop an aircraft engine to address the 150-seat single aisle aircraft market. The collaboration, between four of the world’s leading aero engine manufacturers, produced the V2500 – the second most successful commercial jet engine program in production today in terms of volume, and the third most successful commercial jet engine program in aviation history.
Document 13: Fairchild Dornier 428JET: The Fairchild Dornier 428JET was a program undertaken by Fairchild Dornier to develop a 44-seat regional jet aircraft. The program was part of a broader attempt by the company to develop a family of regional jets, comprising the 328JET, 428JET, and the 728 series. This family of aircraft was designed to compete with the Bombardier CRJ and Embraer ERJ/Embraer E-Jets families. The aircraft was announced on May 19, 1998. It was cancelled in 2000.
Document 14: History of Braathens SAFE (1946–93): Braathens South American & Far East Airtransport A/S or Braathens SAFE was founded by ship-owner Ludvig G. Braathen in 1946. It started as a charter airline based at Oslo Airport, Gardermoen in Norway, flying to destinations in the Far East and in South America. At first the airline used Douglas DC-4s, and later also Douglas DC-3s. In 1948, the airline moved to Oslo Airport, Fornebu and started regular scheduled flights to the Far East. In 1952, the airline started cooperation with the Icelandic airline Loftleidir, where until 1960 the two airlines in cooperation flew flights to Reykjavík. Domestic services started in 1951, using de Havilland Herons on a route from Oslo to Stavanger via Tønsberg. Braathens SAFE also established at Stavanger Airport, Sola. A second route was started two years later to Trondheim. The Heron routes also stopped in Farsund, Kristiansand, Notodden to Stavanger and Hamar, Røros to Trondheim.
Document 15: List of Braathens destinations: Braathens (until 1998 known as Braathens SAFE) was a Norwegian scheduled and charter airline that operated from 1946 to 2004. The airline used 53 airports serving 50 destinations, 23 of which were in Norway and 6 in Sweden. Braathens provided international services to 24 airports serving 22 cities in 17 countries. Seven of these cities are in Asia, the rest in Europe. In addition, Braathens served numerous destinations as both a regular and an ad-hoc charter airline. Braathens' main hubs were Oslo Airport, Fornebu (1949–98), Oslo Airport, Gardermoen (1998–2007) and Stockholm Arlanda Airport (1997–99). The main technical base was at Stavanger Airport, Sola.
ground_truth: Dornier Do 228