It's interesting what's obvious to some people. What's "obvious" to you could not be further from the truth. But that's another discussion.

So your theory posits that only people under the planes were jumping. Does the visual evidence bear that out? (I already know the answer to that question as does everyone else who saw it broadcast live.)

Also, are you really suggesting that people hear a loud "boom" and go, "That sounds close! Although that 'boom' didn't kill me, I'd best just jump out this window and kill myself for certain!"

Let me know if I'm reading your post incorrectly: That loud and frightening noises inspired men and women from all sides of the towers to break windows and leap to their deaths.