The Solar Impulse has left Mountain View, California, bound for Phoenix, Arizona, on what is the 10th leg of its round the world quest. A short 16hr hop.

http://www.bbc.co.uk/news/science-environment-36186227

This is almost as cool as the Helios was !

http://spaceplace.nasa.gov/helios/en/

It flew 250 km/h at 100 000 ft !