The point of this - other than the obvious, that New York is a pain in the butt at rush hour - is that pavement, not airspace, is the fundamental congestion problem. There was plenty of space in the air, but only one airplane could use the runway at a time, and it was being used for landings. If Westchester had a parallel runway, takeoffs could have been conducted as soon as the landing airplane was down and rolling. Without that extra runway, there was no way capacity could be increased. Pilots were doing an excellent job of spacing themselves on the visual approach, and the airplane ahead was turning off the runway as the next one was nearing the numbers. Only formation landings could have increased capacity, and nobody is ready for that.