Which state-owned entity operates Norway's second-busiest airport, located just south of Grimstadfjorden?
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.
Notodden Airport, Tuven Notodden Airport, Tuven (Norwegian: "Notodden flyplass, Tuven" ; IATA: NTB, ICAO: ENNO ) is a municipal regional airport at Heddal in Notodden, a municipality in Telemark county, Norway. The airport is mostly used for general aviation, and has extensive sailplane activity. Bergen Air Transport operates the airport's only scheduled route, six times per week to Bergen Airport, Flesland. In 2011, the airport had 5,078 aircraft movements and 3,423 passengers. The airport has a single 1393 by runway with flight information service and instrument landing system. In connection with the airport is a water aerodrome, which uses the lake of Heddalsvatnet for take-off and landing.