During the Airbus Summit, the European aerospace manufacturer announced its development of a hydrogen-powered fuel cell engine for zero-emission aircraft. This propulsion system aims to equip Airbus's fleet with zero-emission capabilities by 2035, with ground tests expected to start in the mid-2020s. Airbus plans to conduct flight tests utilizing one of three prototype ZEROe demonstrator aircraft between 2027 and 2028. These aircraft will feature liquid hydrogen tanks and distribution systems to test various hydrogen propulsion configurations. Airbus highlighted two main alternatives for hydrogen use in air vehicle propulsion: combustion in a gas turbine or conversion to electricity via fuel cells to power a propeller engine. The company is also considering a hybrid-electric system that combines a gas turbine with fuel cells. Hydrogen fuel cells are noted for their power and scalability, producing no nitrogen oxide emissions or condensation trails. Glenn Llewellyn, VP of Zero-Emission Aircraft at Airbus, expressed optimism about fuel cells as a potential solution to achieve zero-emission goals, emphasizing the importance of testing the technology for feasible and viable integration into aircraft by 2035. Airbus also announced partnerships to enable the availability of green hydrogen at airports, supporting the movement towards decarbonisation in aviation.