The Solar-powered Solar Impulse 2 aircraft prepares to take off from the Cairo International Airport in the Egyptian capital on Sunday as it heads to Abu Dhabi on the final leg of its world tour. Khaled Desouki /AFP/Getty Images hide caption

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Solar Impulse 2, piloted by Swiss pilot Bertrand Piccard, prepares to land in Seville, Spain, on Thursday. Jean Revillard/AP hide caption

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'Beautiful Flight' Across The Atlantic Is Major Milestone For Solar Plane

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The Solar Impulse 2, piloted by Bertrand Piccard, takes off from John F. Kennedy International Airport in New York on Monday, starting a four-day journey to Southern Spain. Jean Revillard/AP hide caption

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Solar Impulse 2, the solar airplane of Swiss pioneers Bertrand Piccard and Ande Borschberg, in preparation for the take off from Tulsa International Airport, Oklahoma on Saturday. Getty Images hide caption

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Solar Impulse 2 pilots Bertrand Piccard (right) and Andre Borschberg celebrate after Piccard landed their solar-powered plane at Moffett Field in Mountain View, Calif., on Saturday. Noah Berger/AP hide caption

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The Solar Impulse 2 airplane, piloted by Bertrand Piccard, gains altitude after taking off from Kalaeloa Airport in Kapolei, Hawaii during a test and training flight in April. Eugene Tanner /AFP/Getty Images hide caption

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The Solar Impulse 2 landed in Hawaii in early July. The team behind the sun-powered airplane says it will be grounded until next spring. Solar Impulse | Revillard | Rezo/Solar Impulse | Revillard | Rezo hide caption

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Pilot Andre Borschberg of Switzerland sits aboard the Solar Impulse as a ground crew pushes the plane at the airport in Nagoya, Japan, prior to taking off for Hawaii. Toshifumi Kitamura/AFP/Getty Images hide caption

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