Question: Which airline, with the abbreviation DAT, operates two daily flights to Oslo Airport, Gardermoen? 

Context paragraphs:
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.

Flytoget: Flytoget, the Airport Express Train (Norwegian: "Flytoget" ) is a Norwegian high-speed airport rail link connecting Oslo Airport, Gardermoen to Oslo Central Station in nineteen minutes.  Run by Flytoget AS (formerly NSB Gardermobanen AS), it operates on the high-speed Gardermoen Line using sixteen GMB Class 71 electric trains.  Normal service frequency is once every ten minutes, with five of the services each hour continuing westwards beyond Oslo Central.  The extended services serve nine stops within Greater Oslo and take up to 60 minutes.

Stord Airport, Sørstokken: Stord Airport, Sørstokken (Norwegian: "Stord lufthavn, Sørstokken" ; Nynorsk: "Stord Lufthamn" ; IATA: SRP, ICAO: ENSO ) is a municipal regional airport located at Sørstokken in Stord, a municipality in Hordaland county, Norway.  Located 13 km from Leirvik and on the island of Stord, it is the only airport with scheduled services in Sunnhordland.  The airport consists of a single asphalt 1460 x runway designated 14/32.  It is classified as an airport of entry.  Danish Air Transport operates up to two daily flights to Oslo Airport, Gardermoen.  Previously the airport has been served by Coast Aero Center, Fonnafly, Air Stord, Teddy Air, Widerøe and Sun Air of Scandinavia.

Danish Air Transport: Danish Air Transport A/S, often abbreviated DAT, is a Danish airline headquartered in Vamdrup, Kolding Municipality, operating scheduled and chartered passenger and cargo flights.

Oslo Airport, Fornebu: Oslo Airport, Fornebu (IATA: FBU, ICAO: ENFB) (Norwegian: "Oslo lufthavn, Fornebu" ) was the main airport serving Oslo and Eastern Norway from 1 June 1939 to 7 October 1998.  It was then replaced by Oslo Airport, Gardermoen and the area has since been redeveloped.  The airport was located at Fornebu in Bærum, 8 km from the city center.  Fornebu had two runways, one 2370 m 06/24 and one 1800 m 01/19, and a capacity of 20 aircraft.  In 1996, the airport had 170,823 aircraft movements and 10,072,054 passengers.  The airport served as a hub for Scandinavian Airlines System (SAS), Braathens SAFE and Widerøe.  In 1996, they and 21 other airlines served 28 international destinations.  Due to limited terminal and runway capacity, intercontinental and charter airlines used Gardermoen.  The Royal Norwegian Air Force retained offices at Fornebu.

Oslo Airport Station: Oslo Airport Station (Norwegian: "Oslo lufthavn stasjon" ), also known as Gardermoen Station, is a railway station located in the airport terminal building of Oslo Airport, Gardermoen in Norway.  Located on the Gardermoen Line, it is served by the Airport Express Trains, express trains to Trondheim and Oslo, regional trains to Lillehammer and Skien (via Oslo) and commuter trains to Eidsvoll and Kongsberg (via Oslo).

Gardermoen, Norway: Gardermoen is an area in Ullensaker, Norway.  In 1998, it had a population of 259 people.  Oslo Airport, Gardermoen, Gardermoen Air Station, Norwegian Armed Forces Aircraft Collection and Oslo Airport Station (train station) are located in the area.

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.

Oslo Airport location controversy: The location of the main airport serving the city of Oslo, Norway, has been the subject of several political debates since 1918.  The first controversy was initially related to choice between the islands of Gressholmen and Lindøya in the Oslofjord for a water aerodrome.  The debate later changed, arriving at the decision in 1933, to locate a new airport at Fornebu.  However, Oslo Airport, Fornebu, being located on a peninsula, proved to not have sufficient space for a runway capable of intercontinental aircraft and a second runway, resulting in plans from the 1960s to replace it.  The main contestants were Gardermoen Air Station, Hurum, Hobøl, Ås and a split solution between Fornebu and Gardermoen.  In 1992, parliament decided to build an all-new Oslo Airport, Gardermoen; when it opened in 1998, Fornebu was closed.  The decision caused the southern parts of Eastern Norway to be moved further from the main airport, and the regional, privately owned Sandefjord Airport, Torp became the base for low-cost airlines. Moss Airport, Rygge opened in 2007, becoming the third simultaneous airport to serve Oslo, and closed in 2016.

Romerike Police District: Romerike Police District (Norwegian: "Romerike politidistrikt" ) is one of 27 police districts in Norway, covering the Romerike district of Akershus.  The district is headquartered in Lillestrøm and consists of two police stations, at Lillestrøm and Gardermoen (at Oslo Airport, Gardermoen), and nine sheriff's offices.  The district is led by Chief of Police Jørgen L. Høidahl.  Specifically the police district covers the municipalities of Aurskog-Høland, Sørum, Fet, Rælingen, Lørenskog, Skedsmo, Nittedal, Gjerdrum, Ullensaker, Nes, Eidsvoll, Nannestad, Hurdal.  As of 2011 the district had 651 employees.  It has a special responsibility for the border control at Oslo Airport, Gardermoen.

Supporting paragraphs: Stord Airport, Sørstokken Danish Air Transport
Answer: Danish Air Transport