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The Solar Impulse 2 aircraft completed an historic flight in its quest to circle the globe without consuming a drop of fuel, touching down gracefully in Hawaii on Friday after the most arduous leg of its journey. The sun-powered plane, piloted by veteran Swiss aviator Andre Borschberg, took five days to make the historic voyage from Japan to Hawaii and landed shortly after dawn at Kalaeloa Airport on the main Hawaiian island of Oahu. "Just landed in #Hawaii with @solarimpulse! For @bertrandpiccard and I, it's a dream coming true," Borschberg tweeted triumphantly upon after completing the most dangerous leg of the around-the-world journey.