> Once LH2-powered aircraft enter any given market, kerosene-powered craft would be wholly unable to compete. Liquid hydrogen has about 1/4 the energy density

> Once LH2-powered aircraft enter any given market, kerosene-powered craft would be wholly unable to compete. Liquid hydrogen has about 1/4 the energy density of kerosene by volume. It's better per kilo which is nice for aircraft but you're still looking at finding lots more space in the structure for fuel or accepting that you can't fly very far. I don't see that being competitive with kerosene.