It is. For airplanes it's probably better to lose 30% of the energy and synthesize carbon based fuels. Hydrogen is still useful as a store of energy to smooth

It is. For airplanes it's probably better to lose 30% of the energy and synthesize carbon based fuels. Hydrogen is still useful as a store of energy to smooth out seasonal variations in solar and wind production though. On a large scale it's more difficult to store than natural gas due to embrittlement but not impractical.