PropPiedmont
SWA can't park the aircraft, here is what SL6 says.
"The ratio of scheduled operational Southwest Airlines aircraft to total AirTran aircraft will not drop below the pre-transaction ratio of 3.61 to 1 (SWA to AirTran) during the period prior to complete pilot integration."
So SL6 counts all AirTran aircraft but only the operational SWA aircraft.