Yes. The round-trip conversion to first produce then use hydrogen is significantly less efficient than directly using the electricity or fossil fuels themselves. Problem is batteries aren't energy dense enough for long-range flight and fossils are dirty. However, hydrogen - unless frozen and compressed - also has terrible energy density and requires highly specialized storage and handling. The better solution IMO is not stopping at hydrogen but going to fully synthetic fossil fuels, but either way will require massive surpluses of green power that don't exist yet. Right now 99% of hydrogen comes from natgas.