Question: Which state-owned entity operates Norway's second-busiest airport, located just south of Grimstadfjorden?

Context paragraphs:
Bergen Airport, Flesland: Bergen Airport, Flesland (Norwegian: "Bergen lufthavn, Flesland" ; IATA: BGO, ICAO: ENBR ) is an international airport located at Flesland in Bergen, a city and municipality in Hordaland county, Norway.  Opened in 1955, it is the second-busiest airport in Norway, with 6,078,589 passengers in 2014.  Flesland is operated by the state-owned Avinor.  Until 1999 Flesland Air Station of the Norwegian Air Force was co-located at the airport.

China National Nuclear Corporation: The China National Nuclear Corporation (CNNC; ) is a state-owned entity founded in 1955 in Beijing.  CNNC's president and vice-president are appointed by the Premier of the State Council.  However the CNNC is a self-supporting economic corporation, not a government administrative body.  It oversees all aspects of China's civilian and military nuclear programs.  According to its own mission statement, it "is a main part of the national nuclear technology industry and a leading element of national strategic nuclear forces and nuclear energy development."  CNNC is a nationwide industrial conglomerate integrating science, technology, industry, and international trade.

Brønnøysund Airport, Brønnøy: Brønnøysund Airport, Brønnøy (Norwegian: "Brønnøysund lufthavn, Brønnøy" ; IATA: BNN, ICAO: ENBN ) is a regional airport located at the town of Brønnøysund, in the municipality of Brønnøy, Nordland county, Norway.  The airport is owned and operated by the state-owned Avinor and serves the southern part of Helgeland.  It has a 1200 x runway numbered 04–22 and is served by Widerøe, which operates their Bombardier Dash 8 aircraft to Oslo, Trondheim, Bodø, Bergen and other airports in Helgeland.  The airport also serves offshore helicopter flights by CHC Helikopter Service to Norne and temporary oil rigs in the Norwegian Sea.  In 2014, the airport served 117,471 passengers, making it the second-busiest regional airport in Norway, after Florø Airport.

Ottawa Macdonald–Cartier International Airport: Ottawa/Macdonald–Cartier International Airport or Macdonald–Cartier International Airport ("L'aéroport international Macdonald-Cartier" in French), (IATA: YOW, ICAO: CYOW) in Ottawa, Ontario, Canada is an international airport named after the Canadian statesmen and two of the "founding fathers of Canada", Sir John A. Macdonald and Sir George-Étienne Cartier.  Located in the south end of the city, 5.5 NM south of downtown Ottawa, it is Canada's sixth-busiest airport and Ontario's second-busiest airport by airline passenger traffic and Canada's seventh-busiest by aircraft movements, with 4,743,091 passengers and 153,347 aircraft movements in 2016.  The airport is an Air Canada focus city and the home base for First Air.  The airport is classified as an airport of entry by Nav Canada and is staffed by the Canada Border Services Agency.  The airport is one of eight Canadian airports that have United States border preclearance facilities.  The airport used to be a military base known as CFB Ottawa South/CFB Uplands.  Although it is no longer a Canadian Forces Base it is still home to the Royal Canadian Air Force's 412 Transport Squadron.

Nordåsvannet: Nordåsvannet or Nordåsvatnet is a bay in the municipality of Bergen in central Hordaland county, Norway.  Located about 10 km south of the centre of the city of Bergen, it separates the boroughs of Fana and Ytrebygda from the borough of Fyllingsdalen.  Nordåsvannet has an area of about 5 km2 , and is connected to the Grimstadfjorden at its far western end.  The entire fjord, consisting of the Grimstadfjorden and Nordåsvannet, is known as the Fjøsangerfjorden.  It is approximately 11 km long.

Grimstadfjord: Grimstadfjord or Grimstadfjorden is a small fjord in the municipality of Bergen in Hordaland county, Norway.  The 4 km long fjord lies on the western side of the Bergen Peninsula, and it divides the Laksevåg and Ytrebygda boroughs of the city of Bergen.  The Grimstadfjorden lies just north of Bergen Airport, Flesland and the Norwegian naval base Haakonsvern lies on the northern shore of the fjord.  The lake Nordåsvannet flows to the west into this fjord and then this fjord flows west into the large Raunefjorden.  The island of Bjorøy lies at the western mouth of the Grimstadfjorden.

Oslo Airport, Gardermoen: Oslo Airport (Norwegian: "Oslo Lufthavn" ; IATA: OSL, ICAO: ENGM ) is the main international airport serving Oslo, the capital of and most populous city in Norway.  Oslo is also served by the low-cost airport Torp in Sandefjord, situated 119 km to the south of downtown Oslo.  Oslo Airport is the main domestic hub and international airport in Norway, and is the second-busiest airport in the Nordic countries.  A hub for Scandinavian Airlines, an operating base for Norwegian Air Shuttle, and a focus city for Widerøe, it connects to 31 domestic and about 128 international destinations.  Almost 26 million passengers traveled through the airport in 2016, making it the nineteenth-busiest airport in Europe.

National Board of Health (Denmark): The Danish Health Authority (Danish: "Sundhedsstyrelsen" ) is a state-owned entity in Denmark sorting under the Ministry of Health.  It was founded in 1909 and is situated in Copenhagen in the area of Islands Brygge.

Nantucket Memorial Airport: Nantucket Memorial Airport (IATA: ACK, ICAO: KACK, FAA LID: ACK) is a public airport on the south side of the island of Nantucket in the U.S. state of Massachusetts.  The airport is owned by the Town of Nantucket and is located three miles (5 km) southeast of the town center.  It is the second-busiest airport in the state, after Logan International Airport due to intense corporate travel to and from the island in the busy summer months.

Cape Town International Airport: Cape Town International Airport (IATA: CPT, ICAO: FACT) is the primary airport serving the city of Cape Town, and is the second-busiest airport in South Africa and third-busiest in Africa.  Located approximately 20 km from the city centre, the airport was opened in 1954 to replace Cape Town's previous airport, Wingfield Aerodrome.  Cape Town International Airport is the only airport in the Cape Town metropolitan area that offers scheduled passenger services.  The airport has domestic and international terminals, linked by a common central terminal.

Supporting paragraphs: Grimstadfjord Bergen Airport, Flesland
Answer: Avinor