Nottingham in particular has some big employers based there; capital one, experian, eon, boots, revenue & customs etc plus reasonable financial and law sectors. If the airport were linked directly to the city centre the demand for business flights both domestic and to Benelux & Germany would increase a little. You'd also need to add to this links to Derby, Leicester and a mainline train station. What I'm driving at is the fact EMA is simply not easy to get to from all of the regions major employment areas.