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In this image provided by Solar Impulse, the sun-powered plane The Solar Impulse glides over the Golden Gate Bridge in San Francisco during a successful test flight on Tuesday, April 23, 2013. The solar-powered airplane is preparing for a journey around the world, scheduled to begin on May 1. The Solar Impulse is powered by about 12,000 photovoltaic cells that cover massive wings and charge its batteries, allowing it to fly day and night without jet fuel. It has the wing span of a commercial airplane but the weight of the average family car, making it vulnerable to bad weather. (AP Photo/Solar Impulse)