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The world's first four-seater plane HY4 that uses emission-free hybrid fuel-cells to fly is pictured at the airport in Stuttgart, Germany, Thursday, Sept. 29, 2016. A 10-minute test flight Thursday at the airport in southwestern Germany involved two pilots and two dummy passengers. (Christoph Schmidt/dpa via AP)

The world's first four-seater plane HY4 that uses emission-free hybrid fuel-cells to fly is pictured at the airport in Stuttgart, Germany, Thursday, Sept. 29, 2016. A 10-minute test flight Thursday at the airport in southwestern Germany involved two pilots and two dummy passengers. (Christoph Schmidt/dpa via AP)

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