Although a truly accurate answer would take a detailed 'life cycle' analysis, my suspicion is that - once large amounts of 'green' electricity are available - it would make more sense to 'manufacture' more conventional hydrocarbon fuels - using CO2 extracted from the air and H2 produced by 'green' electricity. The basic technology already exists so no pie-in-the-sky technological breakthroughs required (aside from creating the green electricity). Done properly, this can be 'carbon neutral' (simply removing CO2 from the air then re-releasing it back as turbine exhaust gases). It would bypass all the difficulties of handling and transporting huge amounts of H2 since synthetic hydrocarbon type fuels could be readily handled/transported using the existing infrastructure - and it would eliminate all those nasty issues associated with carrying enough H2 on an aircraft for long range operations.