ZeroAvia, a company based in Everett, Washington, and the United Kingdom, is making significant strides in developing zero-emission airplane engines powered by liquid hydrogen. They are currently conducting tests on hydrogen fueling of aircraft at Stockton Municipal Airport. The company received a $3.3 million grant from the California Energy Commission to design trucks for quick liquid hydrogen fill-ups for aircraft and other heavy-duty equipment. ZeroAvia aims to enable passenger and cargo flights using hydrogen-electric engines by the end of the year and is collaborating with Alaska Airlines to introduce hydrogen-powered engines to a De Havilland Canada Dash-8 turboprop aircraft by 2027. Despite the challenges of keeping hydrogen in liquid form at extremely cold temperatures, ZeroAvia remains determined to achieve its goals. The company's presence at Stockton Metropolitan Airport is seen as a positive development by airport officials, who view it as a step towards establishing the region as a hub for innovative technology and environmental sustainability in the aviation industry. The move aligns with the airport's vision of supporting companies involved in green energy initiatives as part of shaping the future of aviation. With the increasing focus on renewable energy sources and environmentally friendly transportation solutions, ZeroAvia's ambitious endeavors in hydrogen-powered aircraft engines represent a promising shift towards more sustainable aviation practices. The collaboration with Alaska Airlines and the planned research facility at Stockton Metropolitan Airport signify progress towards a cleaner and greener future for the aviation sector.