Engineering reports were made of both Herdla and Flesland in 1950 and 1951. Previous investigations of Flesland had concluded that the length of the runway was limited to a small valley which is located at about the middle of the current runway. The new report proposed connecting the proposed area to a larger area to the south of the valley, which was at the right elevation. This would allow for a long runway. A political concern was the high cost of constructing a new airport. By 1950 land airports had been built for Oslo Airport, Fornebu, Stavanger, Trondheim and Kristiansand. This was supplemented with SAS deciding to terminate the services to Oslo and instead provide a feeder service to Stavanger.