Sure they know how to do 20 minute turns in BWI -- the only catch is that you either have to have >100 thru pax, or < 30 pax getting off AND coming on, or have 4 ops agents working the flight. If you have any of those conditions, even BWI can do 20 minute turns all day long!They know how to do 20 minute turns in BWI? Hogwash!
MDW, on the other hand, can only do 20 minute turns as long as there aren't any wheelchairs coming on or off; those stoneage elevators in the gates delay things beyond belief in the old gates in Chicago!
It's all good, though -- just an excuse to request direct from every new controller!