ASL Aviation Holdings has entered a conditional purchase agreement with ZeroAvia to acquire up to 20 hydrogen-electric engines for retrofitting into its fleet of ATR regional turboprop aircraft. This partnership aims to develop some of the world's first zero-emission freight aircraft on a large scale. The firm order includes 10 engines, with an option for an additional 10, and encompasses an agreement for retrofit services. The use of hydrogen-electric engines facilitates the conversion of hydrogen fuel into electricity through fuel cells, eliminating CO2 and other climate-affecting emissions, emitting only low-temperature water vapor. The electricity produced powers electric motors that drive the propellers, potentially reducing in-flight emissions by approximately 90% and offering cost advantages through lower maintenance. ZeroAvia has made progress by conducting multiple test flights of a prototype 600kW system and is currently working on certification with regulators for larger systems intended for ATR family aircraft, a significant milestone for ASL Airlines. The initiative aligns with ASL's broader ESG strategy, emphasizing sustainability and a reduction in CO2 emissions across its airline brands. ASL has also established ASL CargoVision, a platform in collaboration with technology leaders to promote awareness of innovative technologies and sustainability in air cargo operations. The sentiment in the article is positive, highlighting ASL's commitment to sustainable aviation practices and ZeroAvia's advancements in clean propulsion technology. Both companies view the adoption of hydrogen-electric engines as a crucial step towards achieving aviation sustainability, benefiting both people and the planet.