A/S Fred. Olsens Flyselskap (FOF), trading internationally as Fred. Olsen Airtransport, was a Norwegian charter airline which operated between 1946 and 1997, largely operating cargo aircraft. Based at Oslo Airport, Fornebu, it was created as a spin-off of Norwegian Air Lines and was part of Fred. Olsen & Co., which owned it through its subsidiaries Ganger Rolf and Bonheur.

Oslo Airport, Fornebu (IATA: FBU, ICAO: ENFB) was the primary international airport serving Oslo and Eastern Norway from 1 June 1939 to 7 October 1998. It was then replaced by Oslo Airport, Gardermoen, and the area has since been redeveloped. The airport was located at Fornebu in Bærum, 8 km (5.0 mi) from the city center. Fornebu had two runways, one 2,370 m (7,780 ft) 06/24 and one 1,800 m (5,900 ft) 01/19, and a capacity of 20 aircraft. In 1996, the airport had 170,823 aircraft movements and 10,072,054 passengers. The airport served as a hub for Scandinavian Airlines System (SAS), Braathens SAFE and Widerøe. In 1996, they and 21 other airlines served 28 international destinations. Due to limited terminal and runway capacity, intercontinental and charter airlines used Gardermoen. The Royal Norwegian Air Force retained offices at Fornebu.