I find it hard to believe this is really an issue...
I can understand (although I may not agree completely with) the USAir folks problems with the seniority intergration, but if they REALLY do (which I doubt) have a problem with using a Catus callsign, than it says they have no respect for the "merger" and have lost what support I was giving them.
But again, I doubt they really do have a problem with Catus.
Then again, I've been wrong before...