Back when we had the MKE base, those pilots had the same bennies we all had. UA, DL and YX. I used to live in PHL, was based in ORD and would sometimes pick up trips out of MKE and I had priority on YX and SKW operated YX connect flights over Air Wisconsin and USairways guys trying to get to and from MKE.

Currently my understanding is that DEN and ORD based pilots may get Airtrain bennies when they become available because those are the two bases who get flowed into the AirTran Codesharing system, however they won't forfeit their UA/DL priviliges.