The UK Civil Aviation Authority (CAA) has announced the extension and expansion of its Hydrogen Challenge with the launch of a second phase. The initiative is geared towards accelerating the development of hydrogen propulsion, airport infrastructure, and aircraft systems to facilitate the shift to zero-carbon aviation. The Hydrogen Challenge involves leading UK companies collaborating with the CAA to advance technology and infrastructure necessary for hydrogen-powered aviation, focusing on areas like aircraft innovation, airport infrastructure, scientific research, and safety assessments. The extended three-year phase will further refine technologies and prepare the aerospace sector for the widespread adoption of hydrogen fuel. Key projects under this initiative include testing new aircraft designs utilizing hydrogen fuel cells, researching hydrogen combustion processes, developing safe hydrogen storage and refueling practices, and creating high-altitude hydrogen-powered aircraft for various applications. These projects involve a range of innovative companies and research institutions, aiming to drive the UK towards becoming a global leader in hydrogen propulsion, fostering sustainable aerospace solutions, and supporting economic growth.