According to the British Broadcasting Corporation (BBC) July 14, 2010, Boeing recently demonstrated the company's developed "PhantomEye" hydrogen-powered unmanned reconnaissance aircraft, sustainable flight for 4 days. According to the company, the "PhantomEye" wing width is 46 meters, equipped with a four-cylinder engine, each cylinder can provide 150 horsepower, the entire hydrogen fuel system "more light and more powerful", and can fly at 20,000 meters of height, carrying out continuous reconnaissance tasks. According to the company's officials, the design "phantomeye" is considering its long-lasting flight capability, rather than the hidden performance of the ghost eye" appearance is to challenge the company's "Oakland" unmanned aircraft