Solar Impulse, the one-of-a-kind solar-powered aircraft designed to fly around the world, is now in Dubai, where it will launch in March. The aircraft was built and tested in Switzerland. It was then disassembled and flown to Dubai aboard a cargo airplane. Andr Borschberg and Bertrand Piccard, who have led the effort, said they are confident in the aircrafts capability and their own training, and they will take turns as pilot. The expedition is expected to take 25 days of flying, and will be completed in stages over four or five months. Some legs above the Atlantic and Pacific will require five to six days of nonstop solo flight. The aircrafts wings measure about 236 feet across, and carry more than 17,000 solar cells.