[pencilguin]

Airframes equipped to use LH2 will, wherever deployed, lock out competitors without, because the lower takeoff fuel weight allows for more paying cargo instead, and because hydrogen electrolysed right there at the airport should be cheaper per joule than petroleum mined, transported, refined, and transported again.

But inboard LH2 tanks seem to present a safety hazard, wings have not enough room. That seems to leave underslung nacelles. None of the concept designs illustrated have them.