2 different audio tracks .
in one , there are 2 loud bangs when the plane hits the tower.
in the other, you cant hear the plane hit at all, or at least its very low.
 
a guy in the background says HOLY SH** twice.
some other differencesw , if you listen closely.
 
who altered the audio?
is the video altered as well ?
 
which on is real, if any ?
this has got to light a fire soewhere???