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The Solar Impulse, HB-SIA experimental aircraft approaches to make a night landing at Barajas airport for a technical layover, as well as to change pilots, in Madrid in the early hours of Friday, May 25, 2012. The Solar-powered aircraft, the zero fuel airplane, which took of from an airbase in Payerne, Switzerland, Thursday is making its first intercontinental trip with final destination Rabat, Morocco. The Solar Impulse project aims to circumnavigate the world with an aircraft, with a 63.40 meters wingspan, powered only by solar energy. (AP Photo/Paul White)