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|doi-access=free}}</ref> With materials available in the 2020s, the mass of tanks strong enough to withstand this kind of high pressure will greatly outweigh the hydrogen fuel itself, largely negating the weight to energy advantage of hydrogen fuel over hydrocarbon fuels. Hydrogen has a severe volumetric disadvantage relative to hydrocarbon fuels, but future [[blended wing body]] aircraft designs might be able to accommodate this extra volume without greatly expanding the [[wetted area]].
Even if finally practical, the industry timeline for adopting hydrogen is fairly lengthy. Alternatives to conventional aviation fuel available in the near term include [[aviation biofuel]] and synthetically created fuel (aka "e-jet").<ref>{{Cite web|last=Trakimavicius|first=Lukas|date=December 2023|title=Mission Net-Zero: Charting the Path for E-fuels in the Military|url=https://www.enseccoe.org/data/public/uploads/2023/11/d5_mission-net-zero-charting-the-path-for-e-fuels-in-the-military-by-lukas-trakimavicius.pdf |publisher=NATO Energy Security Centre of Excellence}}</ref> These fuels are collectively referred to as "Sustainable Aviation Fuel" (SAF).
==Production of aviation fuel==
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