[rbanffy]

It may be a significant premium over coach, but would be much less significant over business and first class. A Lufthansa now retired 747 carries 8 passengers in first class and about a hundred in business. With a plane like this, LH would be able to carry more first and business passengers over the same amount of time at equivalent prices. Remember Concorde 2 would be much more efficient than the first iteration, and that was with late 60's technology.