The plane Solar Impulse 2 took off from San Francisco early on Monday heading for Phoenix, Arizona – the latest leg of its trip around the world to promote clean energy.
The plane, which runs on solar-powered batteries, had stranded by high winds in California for several days after flying from Hawaii.
After crossing the US it is due to head for Europe.
andreborschberg</a> just took off from San Francisco, direction Phoenix 720 ⚡️miles away <a href="https://twitter.com/hashtag/futureisclean?src=hash">#futureisclean</a> <a href="https://t.co/7pD385EgEC">pic.twitter.com/7pD385EgEC</a></p>— SOLAR IMPULSE (solarimpulse) 2 May 2016
SOLARIMPULSE (@solarimpulse) 2 May 2016