I am BuildsJets now, but 20 years ago I was BuildsCryoFuelsystems. Go look at the cross section of an actual hydrogen-powered aircraft that has flown actual mi

I am BuildsJets now, but 20 years ago I was BuildsCryoFuelsystems. Go look at the cross section of an actual hydrogen-powered aircraft that has flown actual missions under it's own power, such as the Boeing Phantom Eye. The USSR's TU-155 flying testbed aircraft does not count, it did not fly under hydrogen power or fly an actual mission, it just ran an engine in the air. Observe how much of the airframe's space is used by fuel storage, compared to payload. Now do the same thing for a commercial airliner, and realize that commercial aircraft are just barely profitable with their current payload:fuel weight ratio. Also, did you know that when you refuel a liquid hydrogen tank, a significant portion of the fuel is vented off to the atmosphere? In the case of the Space Shuttle, LH2 filling losses are around 20% of total fuel load. Then there are boil-off significant losses while the vehicle sits around warming up. So to be most efficient, you would need to either fuel up IMMEDIATELY before loading passengers, or hot-loading propellant with passengers on-board, like SpaceX does, and the FAA prohibits for commercial passenger operation. There are also boil-off losses in the transportation and storage equipment to consider, and boil-off losses everytime you transfer to a different storage or transportation medium.