FF, it was in the news big time in the States last week. The FAA have identified congestion in ORD as the bottleneck that causes major delays throughout the US. They've demanded...sorry...
requested the airlines to reduce their schedules to relieve the problem. I'm all for that!
Why don't the FAA introduce a Slot system. Its such a ridiculous arrangement at present. Just wastes expensive fuel taxiing around airports for hours on end.