British European Airways Elizabethan Class. 47 passengers, five crew. Two 2,600 h.p. Bristol Centaurus engines. Cruising speed 245 m.p.h. Designed and built by Airspeed Division of the de Havilland Aircraft Co., Ltd., Viscount "Discovery Class" World's first turbo-prop airliner : 47 passengers, Five crew. Four rolls Royce Dart propeller-turbines. Cruising speed 291 m.p.h. designed and built by Vickers-Armstrong's Ltd.