That’s ridiculously short sighted to think out only options are hydrogen or the status quo. Off the top of my head I can think of biofuels plus carbon neutral

That’s ridiculously short sighted to think out only options are hydrogen or the status quo. Off the top of my head I can think of biofuels plus carbon neutral recaptured co2 from excess renewable energy. Diesel electric motors for example with the ‘diesel’ being carbon neutral biofuel. This is actually being tested on large airbus jets currently. Hydrogen is one of the worst possible options for aircraft. Energy density is crap, tankage is heavy, failure modes catastrophic.