A few other resources because this one seems to read just like a PR: https://arstechnica.com/cars/2022/11/rolls-royce-tests-hydrogen-fueled-aircraft-engine-in-

A few other resources because this one seems to read just like a PR: https://arstechnica.com/cars/2022/11/rolls-royce-tests-hydrogen-fueled-aircraft-engine-in-aviation-world-first https://arstechnica.com/cars/2022/11/rolls-royce-tests-hydro... https://www.reuters.com/business/aerospace-defense/rolls-royce-successfully-tests-hydrogen-powered-jet-engine-2022-11-28/ https://www.reuters.com/business/aerospace-defense/rolls-roy... https://www.bbc.com/news/business-63758937 https://www.bbc.com/news/business-63758937 https://simpleflying.com/rolls-royce-hydrogen-tests-turbine-engine/ https://simpleflying.com/rolls-royce-hydrogen-tests-turbine-...