PARIS, June 18, 2013 /PRNewswire/ -- PARIS AIR SHOW -- Pratt & Whitney has delivered the 100 th F135 propulsion system, the power plant for the F-35 Lightning II, to the U.S. government. The conventional take-off and landing (CTOL) engine was delivered ahead of contract requirements and indicates continued progress and successful execution of the F-35 program. Pratt & Whitney is a United Technologies Corp. (NYSE: UTX) company. "With the delivery of this 100 th engine, we are continuing our legacy of fielding the most advanced military jet engine technology to the benefit of the warfighter," said Cliff Stone, director, F135 Engine Program. "We are committed to continuing to improve our production process, sustaining on-time deliveries while reducing cost to ensure the long-term success of the F-35 program." "The F135 is the most powerful engine ever developed for fighter aircraft, and we are immensely proud of the capabilities it offers the F-35," Stone added. "We are making tremendous progress on the program, along with the overall F135 industry team, in delivering the safest, most affordable and reliable propulsion system for our U.S. and international partners, and for a growing community of allied nation customers." Pratt & Whitney has designed, developed and tested the F135 to deliver the most advanced fifth-generation fighter engine for the United States and its allies around the world. To date the engine has powered 3,136 flights and 4,953 flight test hours, with more than 26,000 development and flight test hours completed. F-35B STOVL aircraft have accomplished more than 400 vertical landings. The F-35 Lightning II is a fifth-generation, multi-role fighter designed to replace aging fourth-generation aircraft, with capabilities that enable greater survivability and freedom of operation in highly contested environments. Three distinct variants of the F-35 will replace the A-10 and F-16 for the U.S. Air Force, the F/A-18 for the U.S. Navy, the F/A-18 and AV-8B Harrier for the U.S. Marine Corps, and a variety of fighters for at least ten other countries.