PTI and surrounding cities have tossed SkyBus at least $650,000 if they will expand service from PTI. The incentive package could become very rich indeed if SkyBus turns PTI into another Columbus, OH or at least starts serving a direct flight from Greensboro to another city not currently serviced by an airline at PTI.
SkyBus is a "budget" airline running direct flights from Greensboro to Columbus, OH currently but to fly further, say Boston you pretty much have to stay overnight in Columbus with their current schedule.