SWBKCB - I'm not at liberty to say exactly how much (though if you look hard enough the figure can be found online) but the charter flights were costing the airport a significant amount of money per passenger.
The axing of charter flights coupled with the mothballing of 40% of the terminal is expected to cut the annual loss by as much as half, which is not to be sniffed at, as sad as the loss of flights may be.
So customers are costing the airport money and contributing to its demise!! I now see your point - sorry for my earlier response! Let me contribute therefore, and advise All former DTV customers to travel via Newcastle International Airport and save DTV all the money you've been costing Darlington Airport over the years!! .... But then on a serious note..... Let's invest the taxpayers money on subsidising better surface links to Newcastle International Airport, attracting more flights (possibly a transatlantic daily service) with promoting a wider catchment area, and saving DTV the annual loss by trying to serve direct services from Darlington!!
Sarcasm - "The highest form of intelligism!"