Amidst growing concerns over climate change, various industries are embracing sustainable solutions like hydrogen to reduce reliance on fossil fuels. In the transportation sector, the aviation industry is innovating alternative engine solutions to achieve carbon neutrality. While electric vehicles have made strides in reducing carbon emissions on the road, the aviation industry faces challenges due to the limited energy density of batteries, which are unsuitable for commercial aircraft. ZeroAvia, a pioneering company, has successfully developed a hybrid aviation engine that combines electrical and hydrogen solutions. This innovative approach has garnered significant recognition, with over 2,000 pre-orders for their 600 kW electric propulsion system. The hybrid hydrogen EPS is poised to power small aircraft, revolutionizing short-commute flights. Jetcruzer International's plans to introduce a six-seat hydrogen-electric aircraft signify the industry's commitment to hydrogen developments, aiming for carbon-neutral flights. The success of ZeroAvia and the ongoing advancements in hydrogen technology highlight the importance of investing in diverse sustainable transport solutions. This progress also underscores the varying needs of different transportation sectors, emphasizing the essential role of hydrogen engines in achieving carbon neutrality in aviation.