The first aircraft to operate in Bergen was a demonstration flight by Carl Gustav Cederström on 25 September 1911. The first airport in the Bergen area was Flatøy Air Station, built by the Royal Norwegian Navy Air Service on the island of Flatøy. The water aerodrome was established in 1919, it remained in use until 1940. Norway's first scheduled airline service was started by Det Norske Luftfartsrederi between Bergen, Haugesund and Stavanger in 1920, and operated out of Bergen Airport, Sandviken, a water aerodrome just north of the city center. The aerodrome became the Bergen base for both Norwegian Air Lines and Vestlandske Luftfartsselskap.