I would say give them two weeks after AirTran pulls out for the fares to go back up. I know it took a month after AirTran pulled out PIT-LGA for USAirways' fares to rise, and they are next pulling out of PIT-PHL, so that will definitely rise soon. USAirways plans to now compete head-on with AirTran PIT-MDW so I think its a matter of time before that's gone too. Since PIT-ATL survived even with DL and US also on the route, hopefully they won't disappear altogether like TOL, but I wouldn't be too surprised if it happened here too...