It is highly unlikely they are charging for jumpseaters, at least the first one. That would likely violate the Open Skies Agreement.
There is a lot of misinformation about AirTran's policy, too.
I don't know about USairways, but at AirTran, we will always take 1 offline jumpseater for free, period.
After that, they will sell you a $25. non-rev pass, which is better than getting left behind by some of the other carriers, but not as good as the unlimited jumpseats offered by others.
Our Union has said that we will be working to get back the unlimited jumpseats in our next contract ('05).