With the exception of some of the upstate NY/ and NE cities, you could do the conx via CLT that could be done via PHL without much backtracking in most instances. Even some of the cities that are major connecting flights (MAN with 40-50 MCO customers on many days comes to mind) would be an ideal conx in CLT vs PHL. I dont know how many local people they put on MAN in PHL on any given day, but you'd still be able to get all the Florida cities plus the SE and West from CLT. The cities that have major PHL O&D and not as much conx traffic could stay in PHL and the others could be offered via CLT if they are mostly conx traffic anyway. If LH can do a CLT-MUC run, there must be other cities from CLT that could support a flight or two, even if its a couple times a week.