The European Union Aviation Safety Agency (EASA) organized its inaugural international workshop on certifying aircraft powered by hydrogen, focusing on the future processes and challenges in transitioning to sustainable aviation. While sustainable aviation fuels are immediate emission-reducing measures, EASA recognizes the necessity for alternative fuel sources like hydrogen in the long term. The workshop, attended by over 100 stakeholders from diverse backgrounds, highlighted the importance of a harmonized and collaborative effort to ensure the safety and sustainability of hydrogen-powered aircraft. EASA's certification director emphasized the global nature of sustainable aviation and the critical need for shared knowledge to address safety concerns and certification requirements for hydrogen-powered aircraft. Participants discussed the significant changes in aircraft design necessitated by hydrogen integration, emphasizing the importance of defining certification approaches and fostering cooperation among authorities. Safety challenges surrounding the use of hydrogen as an aviation fuel were acknowledged, given the limited in-service experience with such aircraft. The workshop underscored the importance of exploring technology aspects like hydrogen storage and airworthiness considerations to enhance safety standards. Stakeholders shared insights on ongoing projects addressing weight distribution, fuel storage, and other technical aspects, emphasizing the collective effort required to overcome the numerous challenges ahead. The workshop also delved into key questions on certification boundaries, equipment approvals, and operator engagement timing, highlighting the need to maintain or enhance current safety levels during the transition to hydrogen-powered aircraft. Projects like Clean Aviation and AZEA are already driving innovation and collaboration in the sector, supported by various industry players and research institutions. The engagement of authorities at the right technological maturity stage was discussed, underlining the importance of timing in involving key stakeholders effectively. Overall, the workshop served as a platform to exchange knowledge, foster collaboration, and advance towards a sustainable future in aviation.