Solar Impulse 2 pilot Bertrand Piccard looks out his cockpit window shortly after landing at Moffett Field in Mountain View, Calif., on Saturday, April 23, 2016. (AP Photo/Noah Berger)
Solar Impulse 2 flies over San Francisco, Saturday, April 23, 2016. (AP Photo/Noah Berger)
Solar Impulse 2 flies over San Francisco on Saturday, April 23, 2016. (AP Photo/Noah Berger)
Solar Impulse 2 flies over San Francisco, Saturday, April 23, 2016. (AP Photo/Noah Berger)
Solar Impulse 2 flies over the Golden Gate Bridge in San Francisco, Saturday, April 23, 2016. (AP Photo/Noah Berger)
Solar Impulse 2 flies over San Francisco before landing at Moffett Field on Saturday, April 23, 2016. (AP Photo/Noah Berger)
Solar Impulse 2 lands at Moffett Field in Mountain View, Calif., after crossing the Pacific Ocean on Saturday, April 23, 2016. (AP Photo/Noah Berger)
MOUNTAIN VIEW, Calif. -- A solar-powered airplane landed in California on Saturday, completing a risky, three-day flight across the Pacific Ocean as part of its journey around the world.