I think the suggestions for FL to serve Florida destinations are great from GSP.
G4 is ok for what it is, but as the old AirTran(THE "FIRST"one) they were serving GSP-MCO with an old 737 and doing it pretty well, I vote for MCO flights.Add a LGA flight and you'd fill it too I think.
Remember that FL did have a "tryout" with RJ's that failed, even the state of Florida under Gov. Jeb Bush had "guaranteed" some of that operation.I think they'd be hesitant to go the Q400 route.But as DL turns into the thing it's becoming, I say go AirTran!