East Hartford CT (SPX) Nov 30, 2007 – Pratt And Whitney has delivered the first F135 short-takeoff/vertical-landing (STOVL) propulsion system including the Rolls-Royce Lift System to Lockheed Martin in Fort Worth, Texas. The propulsion system will support airframe and engine interface evaluations for the first STOVL flight test aircraft, scheduled for its initial flight in May 2008. Pratt and Whitney is a United Technologies.