EAST HARTFORD, Conn., Jan. 8 /PRNewswire-FirstCall/ -- Pratt & Whitney's F135 engine and Rolls-Royce LiftFan® successfully powered the Lockheed Martin F-35B Lightning II short takeoff/vertical landing (STOVL) fighter through the first in-flight engagement of its STOVL propulsion system. Pratt & Whitney is a United Technologies Corp. (NYSE: UTX) company.