[pjc50]

> Existing aircraft will be wholly unable to compete on any route where LH2 aircraft operate

? Are you suggesting this will be a result of regulatory action? Since it would most likely be more expensive for the first decade, even if I gave you a tap on the airfield labelled "free H2"

[angiosperm]

It is because the very large difference in fuel weight for a flight leaves radically increased capacity for carrying paying freight. As LH2 produced on-site at airports gets cheaper than Jet-A fuel, the gap widens.

[pjc50]

I'd need to see the numbers on this on joule/kg, and then allowing for the increased tankage size.

[angiosperm]

Volume is cheap, on aircraft. If a normal freighter today takes off with 25t of kerosene, the similar-sized LH2 craft needs only 10t of LH2. That means it can take an additional 15t of paying cargo.