CVG does make money, it has had the highest fares in the country for the past couple of years. The problem is that DL keeps downsizing it and more and more passengers are choosing to drive a little to save alot. CVG makes money, but closing CVG and routing all that feed thru DTW will save make Delta alot more than keeping CVG open.

Remember CVG has the 2nd smallest metro area out of all the hubs, and it has the smallest number of O&D passengers. DTW has a brand new facility and can easilty accomodate all of CVG's traffic.

MEM is a little more complicated as its a fairly larger community, its a little further from ATL, and i'm not sure how much more traffic ATL can handle. Closing MEM might not be a feasable option....yet.