NASA is leading a groundbreaking initiative to revolutionize air travel with hydrogen through the Hy2PASS engine. This project aims to utilize hydrogen not only for zero-emission vehicles but also for sustainable flights. Unlike traditional hybrid models, the Hy2PASS system separates the compressor from the turbine, enhancing energy efficiency and control. Dr. Phillip Ansell of the University of Illinois is spearheading the program with the support of NASA's Innovative Advanced Concepts program. The goal is to optimize aircraft design and performance for energy reduction and safety. By focusing on hydrogen's potential in aviation, NASA aims to create a cleaner and more efficient future for flight. The project highlights the importance of hydrogen fuel cells over heavy electric batteries for long-haul flights. The vision is that the Hy2PASS engine will set a new standard for cleaner aviation, demonstrating hydrogen's essential role in the industry.