Not to bash any cities...
...but I think you need to stop thinking about where the hubs are, and think about what cities are actually "destinations" people want to visit.
New York is obviously a huge destination for tourism. Salt Lake has lots of... uh... skiing, or something. Cincinnati and Minneapolis have... um... sports teams, which nobody from anywhere else wants to go see? Detroit has the Henry Ford museum (I only know this because it's advertised every time Detroit is mentioned) and is otherwise a place people are taught to fear and avoid.
Out of curiosity, is Memphis on the list? What about Los Angeles?