Widerøes Flyveselskap AS, trading as Widerøe, is a Norwegian airline, and is the largest regional airline operating in the Nordic countries. The airline's fleet of 40 Bombardier Dash 8 aircraft, and 3 Embraer E190-E2 aircraft, serves over 40 domestic and international destinations. Widerøe has a turnover of ; carries 2.8 million annual passengers; has 3,500 employees and performs 450 take-offs and landings each day. Public service obligation services to regional airports make up slightly less than half of Widerøe's operations. The remaining services are to primary airports in Northern Norway, and services from Sandefjord Airport, Torp and Bergen Airport, Flesland to other primary airports, and some international services from Oslo/Gardermoen, Sandefjord/Torp, Kristiansand/Kjevik, Stavanger/Sola, Bergen/Flesland and Trondheim/Værnes. The company's head offices are in Bodø, although it retains a large administrative center in Lysaker, Oslo. The main bases are Sandefjord Airport, Torp, Bodø Airport, Tromsø Airport, Langnes, Bergen Airport, Flesland, Kirkenes Airport and Oslo Airport, Gardermoen. Widerøe's operations are focused on point-to-point transit, although the airline essentially feeds medium-haul and international airlines. Widerøe has interlining agreements and participates in EuroBonus for international flights. The airline was established in 1934 by Viggo Widerøe, a notable Norwegian aviator, and was engaged in various general aviation activities in its early days. In 1936, Widerøe started scheduled seaplane flights and, from 1940, also ambulance flights. During the 1940s and 1950s, the airline increased its seaplane routes and established a fleet based on de Havilland Canada DHC-3 Otter and Noorduyn Norseman aircraft. From 1968, Widerøe started flying to STOLports in northern and western Norway using DHC-6 Twin Otters, and later also with Dash 7 aircraft. In 1989, Widerøe bought Norsk Air and started services from Sandefjord.