More have left these carriers for PSA than have departed PSA for these carriers. I left TSA for PSA so, among other things, I wouldn't commute to ORD.

In my new-hire class two were from XJT. In my upgrade class, I was one of two from Comair. There were 16 of us. Six each were upgrading PSA first officers and Endeavor. One was Part 135 or corporate. The last one might have been Envoy.

Of the ones I know, no one wants to leave and return to their former employer. Many want to move on to mainline either through a flow or getting hired somewhere other than AA.

Quantify your observation.