The partners described the test as "a major step towards proving that hydrogen could be a zero carbon aviation fuel of the future and is a key proof point in the decarbonisation strategies of both Rolls-Royce and easyJet".The test took place at an outdoor test facility at the Ministry of Defence's Boscombe Down site, using a converted Rolls-Royce AE 2100-A regional jet engine."This is a true British success story, with the hydrogen being used to power the jet engine today produced using tidal and wind energy from the Orkney Islands of Scotland - and is a prime example of how we can work together to make aviation cleaner while driving jobs across the country."While electric aircraft are emerging as an option for short haul, small scale aircraft, larger jet aircraft are expected to require alternative fuels if they are to decarbonise, with sustainable aviation fuels and hydrogen seen as the likeliest options.However, critics have warned the push to develop zero emission aircraft faces huge technical and infrastructure challenges and as such it is likely to take decades before zero emission aircraft are in widespread operation."