Sorry. I did not post full detail story.
The counter merged in PHL, but system did not.
I mean USairways agent could put us in America West flight from USairways counter, but they could not see load status from there. Since all Us flights to LAX were full, the agent advised us to go America West counter and check the flights before put our names on HP flights.
So, we did. Well we actually tried.
If you read my original post carefully, it's not happen because she wasn't familiar with something.