FAA radar is tracking, in real time, flight 175 after it has supposedly crashed into the WTC. This is perhaps an hour later. Although many people do not believe an aircraft hit the Pentagon or crashed in Shanksville, they still cannot accept that no plane hit the WTC. Perhaps this may help.
3 IFR aircraft in the air in a 30 mile radius of New york city is consistent with one hour of diversions and forced landings.
One hour before you would expect a very large multiple of 3 aircraft to be in the air. NY has several incredibly busy airports.Check anytime on FLIGHT AWARE and count the aircraft within a 30 mile radius of NY. There should be 60 to 100.