I'm wondering how many Talibans are training at that flight school and if the kid was buddies with any of them.
The intercept planes did not reach there in time because from take-off to the hit building is a very SHORT distance. No time for them to get air-born and to the scene.
This responsibility is going to have to be taken by the flight schools. They are going to have to be more alert. Hard to say how they can identify a pilot that is going to do something like this, though.
IMHO this is the significance of this solo kamikaze action: it may mark the start of unilateral acts of terrorism by OBL supporters and other assorted Islemmings.
If even a very tiny % of the Islemmings in the USA wake up on a given day and decide "today is a good day to kill a lot of infidels and collect my 72 virgins", then we are in for a rough time.
Nutty solo actors will not belong to any trackable group, and will be virtually impossible to detect or stop short of their target area.
Imagine instead of a small plane, a 15,000 gallon gasoline tanker truck hijacked and driven into the lobby of the B of A building at 60MPH at ten AM on any monday.