The National Aerospace Laboratory (NLR) has taken a significant step towards achieving sustainable aviation by partnering with zepp.solutions to develop a fuel cell system for a demo flight using liquid hydrogen in 2026. This collaboration will see NLR's electric research aircraft, the Pipistrel Velis Electro, equipped with a hydrogen propulsion line. The project, led by Arjen Kloosterman from NLR, aims to acquire knowledge and experience in integrating hydrogen components into manned aviation, focusing on challenges like airworthiness and safety. Jan Bot of zepp.solutions highlights the value of their fuel cell technology in aviation and the unique challenges it presents. The cooperation between NLR and zepp.solutions is crucial for leveraging each other's expertise and ensuring the success of the demo flight. This initiative is not only a key milestone in sustainable aviation but also a stepping stone for future advancements in hydrogen technology within the aviation industry.