The engine is being developed by British scientists and engineers. It is a hybrid between a conventional jet engine, and a rocket system powered by liquid oxygen. The system will be reusable ...

However, replacing a regular jet engine with a hybrid electric jet engine could help but such technologies are still unproven in the aerospace industry, making decarbonization a formidable ...

While Rolls-Royce and others in the aerospace industry are working on electric and hybrid propulsion systems for aircraft, for long-haul aircraft, at the moment jet engines are the only option.