Beyond Aero, a Toulouse-based start-up, is making strides in the civil aeronautics sector by developing the One, an electric business jet powered by a hydrogen fuel cell. The company's ambitious goals for decarbonization and innovative technology choices were highlighted at the European Business Aviation Conference and Exhibition in Geneva. While Beyond Aero has secured 24 million euros in funding, substantial additional investment is needed for the project's completion, with a revised first delivery date set for before 2030. The engineering team at Beyond Aero is currently focusing on key aspects such as the powertrain, hydrogen fuel tank placement, cooling systems, and adherence to certification regulations. By opting for 700-bar gaseous hydrogen, the company aims to simplify development compared to liquid hydrogen alternatives. Additionally, the integration of large compressors and a sophisticated cooling system presents challenges, but the engineers are striving to maintain a conventional aircraft configuration to facilitate the certification process. One of the major hurdles facing Beyond Aero is the absence of established certification rules for hydrogen-powered aircraft, a challenge the company is tackling in collaboration with EASA and industry leaders like Airbus. The recent flight-testing of a modified ultralight aircraft served as a successful demonstrator of the technology, showcasing the potential of hydrogen-powered aviation in reducing carbon emissions.