I'm not so sure hydrogen is a bad fuel for airliners. They can be
constructed to have large volume - weight is the constraint.
Also, a lot of energy is consumed at take-off, and I suspect most
flying is done over land.
Perhaps airports should be equipped with electromagnetic launchers,
that could launch a hydrogen powered aircraft.
High altitude airports could launch craft at supersonic speed - this
too might have an application for space launch.
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