"No airline will buy the A380 if it can't find an economic case to do so, but there are a large number of European and Asian airlines for whom the aircraft makes much sense. Equally, no airport will waste money it can't recover by building facilities that won't be used - and thus won't be paid for - by their airline customers. A few airports may decide that they'd rather (or they must) lose trade by not providing the facilities even though there is a demand, for reasons of loyalty to resident carriers, or because the demand is insufficient to be economic, or because there simply isn't the real estate available to expand sufficiently."
Very well said.......