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This.

But storage is currently a problem for most airplane sizes, and hydrogen would really shine if coupled with fuel cells, not turbines.

That is, airplanes would really gain from all those useless gadgets companies used to push into cars.

Hydrogen is low energy density and next to impossible to contain or transport without lossage. These are major barriers to commercial adoption absent a breakthrough, laying aside the problem of generation.

Hydrogen has low energy density by volume, but very good energy density by weight. The overhead of the volume might be offset by the gains from the reduced weight, which is especially important for aircraft.

Lossage is certainly a problem, but I think once your aircraft is airborne, you can basically burn any hydrogen as it outgasses.

I was thinking carbon-neutral oil, because we have all the infrastructure already.