The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. The solar-powered plane is ready to continue its revolutionary voyage around the world. After the craft was grounded in Hawaii last July due to overheated batteries, it was repaired and upgraded, and a recent initial test flight proved successful. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane is inspected and readied by it's ground grew before a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane is wheeled out of it's hangar by the ground crew before a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane is moved from its hangar before a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane is prepared to be moved from its hangar before a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane is prepared to be moved from its hangar before a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Eugene Tanner/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)





The Solar Impulse 2 airplane, flown by test pilot Markus Scherdel, flies off the coast of Oahu during a test flight from Kalaealoa Airfield in Kapolei, Hawaii, March 3, 2016. (Photo by Hugh Gentry/Reuters)