Isn't the energy content per kg more important for planes than energy density (J/m³)? Energy per kg is much higher for liquid hydrogen (122.8 MJ/kg) than for k

Isn't the energy content per kg more important for planes than energy density (J/m³)? Energy per kg is much higher for liquid hydrogen (122.8 MJ/kg) than for kerosine (42.8 MJ/kg): https://www.fzt.haw-hamburg.de/pers/Scholz/GF/GF_Paper_DLRK_09-09-08.pdf https://www.fzt.haw-hamburg.de/pers/Scholz/GF/GF_Paper_DLRK_... So planes would look bulkier, but could actually be lighter than before.