Liquid hydrogen would be just fine, it's commonly used for space launch applications systems requiring absolute maximum specific energy... it's specific energy is about three times better than kerosene.

There are just several practical/economic problems with liquid H2...

It's corrosive as heck, if you understand chemistry well it will happily function as a reducing OR an oxidizing agent.

It's explosive as heck (google "challenger").

It needs to be kept cryogenic as heck.

Also it's not very dense, so would take up a lot of volume compared to kerosene. Would need a custom-designed plane for the volume and cryogenic fuel storage, and might have to give up belly cargo for fuel volume. Just a SWAG but I think the fantastic specific energy would offset the weight of additional structure for fuel volume.