Indeed lots of problems looking for clever solutions. Interesting that some commuter outfit in the USA has signed for 12 x Dash 8 conversions. One assumes they’re looking for enough fuel capacity to cover 60 minute sectors, so say about 120 minutes of fuel on board.
If liquid H2 has a much higher density than JetA1 as they say, then one could argue that it requires less mass of fuel to go the same distance. Although there’s no mention of the total volume and mass that is required for its storage on board. I’m guessing JetA1 is still much “lighter” when you take all the supporting hardware for H2 into consideration. On the other hand, wings which don’t need to carry fuel can be made a whole lot lighter.
Many, many variables.
Nevertheless, I’m surprised that H2 as a fuel is actually so far advanced and looks like being practical.