Transporting the "fuel"... Aircraft is the last place we should be putting battery tech - today.

Even cars aren't very good because most of the energy is for moving the vehicle, not the passengers (an existing problem for fuels, but current fuels as noted have a much higher weight-to-energy ratio). And with planes you're transporting less fuel weight as you fly.

Bicycles and motorcycles (or scooters) are the best bang-for-kilowatt right now. We should be promoting those and increasing experience/expertise there.

Even terrestrial trucks make far more sense than aircraft, currently.