 Olsen & Bergenske A/S, DNL started domestic seaplane routes based at Oslo Airport, Gressholmen, and later Oslo Airport, Fornebu, using Junkers Ju 52 aircraft.In 1935, DNL was close to starting transatlantic flights in cooperation with Pan Am, but services never commenced despite purchasing a Sikorsky S-43.After the outbreak of World War II, DNL ceased operations from 1941 to 1946.