Atlantic Crossings
Oldchina, I think that the only demand for airships crossing the Atlantic or other oceans would be for heavy loads. This would be economically viable. As with the excellent example of the Orient Express people would not to go on a relatively slow journey unless there was something to see.
Eeng, Absolutely correct this is one of the environmental benefits of this mode of transport. Heavylift gave an example of moving huge generators to remote areas where there was no suitable road access. The only other way would be damage to the environment.
One of the historic problems with airships has always been the weather at landing sites and setting up a docking mast. With these hybrids no mast is required and they will be able to operate in much higher surface winds.
I didn't know about Roger Munk. He was of great assistance to me when I was writing my thesis. An incredible gentleman.