Rolls-Royce tests hydrogen-fueled aircraft engine in aviation world first

A few other resources because this one seems to read just like a PR:

https://arstechnica.com/cars/2022/11/rolls-royce-tests-hydro...

https://www.reuters.com/business/aerospace-defense/rolls-roy...

https://www.bbc.com/news/business-63758937

https://simpleflying.com/rolls-royce-hydrogen-tests-turbine-...

Sure it can be done. But the payload would be non-cost-effective.

Won't happen in practice.

can be started up and run at low speed = "lack of thrust"

Also, liquid hydrogen takes up around four times the space as the same volume of kerosine = no space for passengers.

(There is a practical limit to the physical size of aircraft in today's world. To go larger, we'd need to scrap the existing airtports and rebuild with new larger expensive ones.)