Science is actively exploring various technologies, including battery-powered aircraft, biokerosene, and hydrogen, to achieve sustainable flying. One promising solution for medium-haul flights is the PEM fuel cell aircraft. In an interview, PhD student Patrick Meyer discusses the importance of optimizing air management systems for fuel cell aircraft. These systems ensure that the fuel cell functions reliably by providing the required pressure, humidity, and temperature. By improving air management, the efficiency of the fuel cell can be enhanced, impacting factors such as weight, consumption, and waste heat. The fuel cell's potential as a propulsion system for medium-haul flights lies in its higher energy density, weight advantages over batteries, emission reduction potential, and efficiency compared to traditional fossil fuels. However, challenges exist in establishing a hydrogen infrastructure, meeting certification requirements, and sourcing renewable energy for hydrogen production. Collaborative projects like the SE²A Cluster of Excellence are working towards overcoming these challenges and making climate-neutral flying with fuel cells a viable option. While it is already possible to fly with fuel cell aircraft on short-haul routes, medium-haul flights present additional complexities. Factors like national hydrogen infrastructure, airport retrofitting, and certification processes for new technologies need to be addressed. Additionally, ensuring that the energy used for hydrogen production comes from renewable sources is crucial for achieving climate-neutral flying. Despite these challenges, ongoing research and collaborative efforts aim to pave the way for a sustainable future in aviation.