Ecojet, the world's first commercial electric airline based in Edinburgh, has entered into an agreement with ZeroAvia to purchase 22 ZA2000 hydrogen-electric engines, with an option for 40 more, marking a significant step towards achieving carbon-free flights. The ZA2000 engine can be retrofitted into regional turboprops, enabling zero-emission flight capabilities. Ecojet plans to start operations with conventionally powered aircraft in late 2024, gradually transitioning to zero-emission aircraft powered by ZeroAvia's engines. ZeroAvia has already tested a prototype of its ZA600 engine and is progressing towards the ZA2000 system for larger regional turboprop aircraft like the ATR72 and Dash 8 400. The innovative hydrogen-electric engines work by using hydrogen to generate electricity, paving the way for efficient and safe zero-emission transport. Both companies are enthusiastic about the potential of hydrogen-electric aviation to revolutionize air travel and make sustainable solutions a reality.