The US Airways planes, and I assume the America West plane, are normal aircraft dispatched in regular service just like any other Airbus 319 or 737 or 757 or whatever they happen to be. As far as I know, they are the same inside; only the paint on the fuselage is different.
US Airways is going hog wild on special paint jobs. They have aircraft painted for predecessor airlines. There is a plane painted for Allegheny Airlines, one for Piedmont, and one for Pacific Southwest. I'm not the plane spotter I used to be, so they may have one painted for Mohawk and Lake Central as well. I love seeing those things.
The Steelers plane took me by surprise. I had gone to
KDCA (Washington National Airport) hoping that a bunch of scanner enthusiasts (people who own radio scanners, which they use to listen to transmissions made by police, fire departments, railroads, aircraft, and so forth) meeting on Gravelly Point, at the end of Runway 19, had not yet left. Well, they had, and on the way back home I looked over and saw the plane. I had to take my bicycle over a few medians and through some flower beds to get a closer view of the plane. The Redskins were playing in Dallas, so why would the Steelers be in DC? Could it be the Penguins? I didn't know. Once I had the tail number, I could look it up online.
One of these days, I'll have the ability to scan Kodachrome slides into .jpgs. When I can do that, I'll be able to upload my pictures of the Duke DC-3. I have never found a picture of that online. Mine might be the first.