Another reason their story stinks is the fact that when they decided to turn their transponders off, and head off coarse, how do you wonder they made such precise routes, because the fact is , planes need to be directed by ground control, you cant look out the window and see you coordinants.
That theory is weak due to the fact there are such things as hand held GPS.
Once your close enough to see N.Y. I think you dont really need anything to target something as large as the twin towers.
Pentagon .. same thing..
Other crashed out in the boonies..who knows ?