DC-4 ASvavar Viking, landing at Bromma. Ordered 1936 by five major US airlines: United, TWA, Panam, American and Eastern. First flight 1938 with with 4 x 1 200 HP Pratt&Whitney Twin Hornet engines. The Swedish International Airline "Svensk Interkontinental Lufttrafik AB" (SILA) ordered in 1945 ten new DC-4s.