Dundee seems to be the only airport (apart from Prestwick) which doesn't see a Loganair service.
I know Aberdeen, Edinburgh and Glasgow are too close for a flight to operate, but could it not have a 3 x weekly service say, to Inverness?
Im suprised Dundee does serve more destinations other than the Scot Air flights to London City. The population of Dundee is about 160,000! I bet Eastern Airways could fill up some of its J31s or J41s to places such as Manchester and Birmingham.