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Prince Albert II of Monaco (C) speaks into a communications console at the control centre for the Solar Impulse 2 solar powered aircraft in Monaco early on March 9, 2015, during the planes take-off from Abu Dhabi in the first attempt to fly around the world in a plane using solar energy. The flight of Solar Impulse 2 will cap 13 years of research and testing by two Swiss pilots with a round-the-world trip in which it will land 12 times and last about 25 days spread over five months. AFP PHOTO / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

Prince Albert II of Monaco (C) speaks into a communications console at the control centre for the Solar Impulse 2 solar powered aircraft in Monaco early on March 9, 2015, during the planes take-off from Abu Dhabi in the first attempt to fly around the world in a plane using solar energy. The flight of Solar Impulse 2 will cap 13 years of research and testing by two Swiss pilots with a round-the-world trip in which it will land 12 times and last about 25 days spread over five months.   AFP PHOTO / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP/Getty Images)