American Airlines has made a significant move towards sustainable aviation by agreeing to purchase 100 hydrogen-electric engines from ZeroAvia. This purchase aligns with the airline's objective to achieve net-zero greenhouse gas emissions by 2050. The engines will be used to power regional jet aircraft, reflecting American Airlines' commitment to reducing emissions and transitioning to cleaner energy sources. ZeroAvia, the manufacturer of these engines, is not only working on a 20-seater hydrogen-powered aircraft but also has its eyes set on developing engines for larger regional aircraft models like the Bombardier CRJ700. This strategic collaboration between American Airlines and ZeroAvia demonstrates a proactive approach to embracing new technologies and sustainable practices in the aviation industry. In contrast to this positive development, another player in the hydrogen aviation sector, Universal Hydrogen, recently faced financial challenges and had to cease operations. Despite this setback, the partnership between American Airlines and ZeroAvia reflects a promising trajectory for hydrogen-electric propulsion systems in commercial aviation. While the focus in the industry is currently on regional aircraft for hydrogen-powered flights, major aircraft manufacturers like Airbus are also investing in hydrogen technology. Airbus is working on a clean-sheet hydrogen-powered aircraft called ZEROe, aiming to introduce it by 2028. This indicates a broader industry trend towards exploring alternative fuels and propulsion systems to achieve sustainable aviation goals.