Hydrogen is 2.8x more energy dense than kerosene for the same unit of mass. But needs four times more volume.

Meaning you actually need less fuel - so it almost negates the increased volume issue. Especially if the efficiency of fuel to thrust is better than fossil fuels.

I believe AirBus is already planning a commercial plane by 2035. So there likely have been developments on how to properly store liquid hydrogen (that eliminates the volume issue). The ZEROe.