This whole situation reminds me of bits out of the movie UNDER SIEGE (denzel washington).
I believe a person with a handheld gps, who has gained previous access to the WTC can record the exact location, thus allowing you to just fly towards that point by the magnetic heading it gives you. Used one before, it is not hard.
Mind you, everything is possible, they must have planned this a long time ago. BUT, let us not raise these killers so highly, as they do not deserve the recognition they are getting now.
Hope they roast 4ever.