I have flown both USAirways Express and United Express, and I think the United Express flying is the best. You can crank #2 before pushback if you can't get an air cart in Dulles. AND they are making improvements there, actually. I believe 2-3 electric GPU's to every finger on top of the diesel ones they already have. I also noticed that they are getting more air carts (don't know how many though). I know it sounds like I'm an optimist, but any improvements are good...

I can't speak for the Continental Connection guys/gals, but I do enjoy the UEX flying. It's not a bad deal...