AirBus has already indicated that hydrogen is their future for sustainability. At least one startup has a plan to have off-site (somewhere other than the airport) filled containers that are plugged into the aircraft instead of a normal refueling.

Electric aircraft have demonstrated flying for over an hour, and several hours is feasible.

No point in these compressed hydrogen things for airplanes. The weight is just too high. Hydrogen aviation only makes sense with cryogenic hydrogen storage IMHo, and only for very long duration

> Electric aircraft have demonstrated flying for over an hour, and several hours is feasible.

With massive downsides. Sure, liquid hydrogen probably makes a lot more sense for a plane than these things. But I don't think "only for very long duration" is true at all.

> The weight is just too high.

did OP not just point to a 4x increase in energy density?

This is not a 4x increase in energy density. It’s functionally the same as high end lithium ion.

And yet aviation technology professionals who presumably know more than either of us have decided that hydrogen is the future for general commercial aviation, not electric craft.

I am an aviation technology professional.

Clearly not, if you believe that lithium-based batteries have anywhere near the energy capacity for large aircraft.