Stock Photo - 25 April 2022, Baden-Wuerttemberg, Friedrichshafen: Flight engineer Michael Lang turns the rotor of the HY4 hydrogen aircraft. The HY4 is the first four-seater passenger aircraft to be powered exclusively by a fuel cell and battery system as an electric aircraft. The international trade fair for general aviation, AERO Friedrichshafen, starts on 27.04.2022 and lasts until 30.04.2022. Shot with long exposure. Photo: Felix Kästle/dpa. - Friedrichshafen/Baden-Wuerttemberg/Germany

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