The report "Sustainable Future Aviation 2025-2045: Trends, Technologies, Forecasts" by IDTechEx highlights hydrogen as a primary solution for decarbonizing the aviation industry. Despite a promising US$20 billion market projection by 2045, careful consideration is crucial regarding technology and hydrogen sourcing to ensure genuine carbon reductions. Aerospace companies must weigh decisions on engine types, hydrogen storage methods, and the color of hydrogen sources to mitigate environmental impacts. While hydrogen internal combustion engines offer familiarity to industry players, fuel-cell electric powertrains promise superior efficiency and reduced carbon emissions. However, challenges like fuel cell longevity pose hurdles for widespread adoption. Additionally, the choice between pressurized and liquid hydrogen significantly impacts aircraft range and storage requirements, with liquid hydrogen showing promise for extended ranges despite the need for cryogenic cooling. The source of hydrogen also plays a vital role, with grey and black hydrogen production methods being criticized for their carbon emissions. Overall, the aviation industry's shift towards hydrogen-powered planes presents opportunities for substantial carbon reductions if technological and sourcing challenges are effectively addressed.