> Hydrogen has a volumetric problem and it just isn't a great fuel for that reason. Even over short distances this is problematic. It just takes up too much spa

> Hydrogen has a volumetric problem and it just isn't a great fuel for that reason. Even over short distances this is problematic. It just takes up too much space. Blended wing body designs may solve the volume problem. It's only intractable if you try to fit the same energy content into a modern airliner that was designed for Jet A. Weight is the usual suspect in aerospace, and fuel weight significantly favors hydrogen over Jet A (factor of ~2), so a blended wing body design with a much larger internal volume wouldn't even have to have equal aerodynamic efficiency in order to be a suitable replacement. To be clear, this is not a simple shift and will probably take decades, but it is merely an engineering challenge rather than a fundamental constraint.