This is all a bit Ho-Hum, old hat.
I remember Lockheed proposals over 30 years ago for a hydrogen powered passenger aircraft. In the late 1950's NASA also successfully converted and flew a B-57 (Canberra bomber) on hydrogen fuel.
Google "Lockheed hydrogen fuel aircraft" for some very interesting reading.
With oil at US$60 per barrel, I would not be surprised if Lockheed haven't already dusted off their old plans and files.........
Woomera