In Cincinnati. Delta Air Lines’ big Midwestern hub isn’t so big anymore. The Cincinnati Enquirer offers up a good analysis into what happened. Basically, too many flights on high cost 50-seat regional jets for a city of Cincinnati’s size. This resulted in the highest fares in the country for eight straight years, and hordes of people driving to Dayton, Indianapolis, Louisville etc. for cheaper flights. And as Delta spokesman Kent Landers put it:

And to be honest, that’s why the model of having such a large hub in a small city is unsustainable over the long run.

Charlotte, of course, is only a slightly larger market than Cincinnati.