The Solar Impulse HB-SIA experimental aircraft flies after taking off from Barajas airport in Madrid, Spain, in the early hours of Tuesday, June 5, 2012. The zero fuel airplane arrived in Madrid on ... more 
The Solar Impulse HB-SIA experimental aircraft flies after taking off from Barajas airport in Madrid, Spain, in the early hours of Tuesday, June 5, 2012. The zero fuel airplane arrived in Madrid on May 25, 2012 from Payerne, Switzerland, and now goes on to Rabat, Morocco on its first transcontinental trip. The mission is described as the final dress rehearsal for a round-the-world flight with a new and improved aircraft in 2014. (AP Photo/Alberto Di Lolli) less 
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Associated Press | Photo By Alberto Di Lolli
Tue, Jun 5, 2012 5:56 AM EDT