I've been a bit slow on this, but in this thread a long time ago I was talking to JohnDoeX about aeroplanes:
http://s15.invisionfree.com/Loose_Change_Forum/index.php?showtopic=6884&view=findpost&p=5652277
He told me (in the post linked to) that taking off from Runway 22 at LGA (That's La Guardia to a thicky like me) takes you directly to the WTC if you don't climb or turn out of it.
I actually got around to checking his story, and found that a direct line drawn through runway 22 takes you...on a path around 3 miles away from the WTC.
No wonder he's not flying if he wanders 3 miles off course, 6 miles from the airport.