Lav Man -
I hate to burst your bubble, but CLT is actually pretty good at doing burn turns when they have to. PIT is very good at it too. With the summer passenge loads those burn turns have slipped, but PIT and CLT are able to do a pretty consistent job. PHL on the other hand....if the flight is scheduled for 35-40 minute turn and the weather and ATC conditions are going our way, they do it. Why is it that during irregular ops, they can't provide the same level of work? Why, because there is an ATC ground delay program, due to enroute weather.....not even at the terminal......can't the aircraft be turned in under an hour? They do it on a regular day without a problem.
Plus stations like LGA, DCA and BOS can do turns that will make your head spin. I have seen DCA turn a 757 in 25 minutes, especially if there is an issue with the curfew. I've been in PHL and heard them being told to get a LGA flight off the gate in 30 minutes (on an A319) in order to make it before curfew and hearing everyone say it can't be done. They don't even try! Say the same thing to CLT and they were able to turn an A321 in 23 minutes and both flights were 90% full.