Solar Impulse attempts intercontinental flight

A Solar Impulse aircraft takes off at Payerne airport May 24, 2012. The Solar Impulse HB-SIA prototype aircraft, which has 12,000 solar cells built into its 64.3 meters (193 feet) wings, attempted its first intercontinental flight from Payerne to Rabat in Morocco with a few days for a technical stop and a change of pilot in Madrid. This flight will act as a final rehearsal for the 2014 round-the-world flight. [Photo/Agencies]

A Solar Impulse aircraft takes off at Payerne airport May 24, 2012. [Photo/Agencies]