I was reading this topic (http://www.airliners.net/discussions/general_aviation/read.main?id=69250) and I wanted to comment on it.
There are several gates at PIT that are not decorated for a particular carrier. Yes, they're on the D concourse.
I believe that PIT is a perfect market for Southwest. Here are my reasons:
1) It's dominated by a single carrier who controls the prices in that market
2) The people of Pittsburgh are thrifty. They like to save money.
3) PIT has very few weather and/or ATC delays.
4) The cost of labor and the cost of living is very low there.
The city of Pittsburgh has offered to build a new maintenance facility at the airport for US Airways. I've heard that US Airways snubbed this offer. If the offer is extended to Southwest, it would make a great east coast maintenance base.
It's just my opinion.