The company announced Wednesday that Raytheon Technologies Corp.’s RTX +0.56% Pratt & Whitney signed a $5.5 Billion modification to the F117 Engine Support Contract previously awarded with the United States Air Force. Pratt & Whitney said that the modification will include an engine performance package which will eliminate over 20 shop visits a month due to increased time on wing. The customer will also save about $29,000,000 a year by reducing fuel costs. The package is designed to improve the fuel efficiency of the F117 engines, allowing them to save up to 6.5 millions gallons per year and reduce CO(2) emissions up to 140,000,000 pounds annually. The contract covers engine services for C-17s that are operated by the USAF, as well as eight international partners. Work will take place at Tinker Air Force Base, Oklahoma, and at facilities in San Francisco, Ohio, and Columbus. Raytheon stock is down 2.9% year-to-date, while S&P 500 SPX, +0.67% is up 16%.