Personally, I am not at all surprised that there is nothing there . Thankfully, the video is available on Youtube as CS points out. Can you see a plane in the video?
Yes - the plane is the big white object that appears in the right of the frame at 25 seconds, shortly before it hits the building in the next frame with a big boom. How can you not see it?
Why didn't the NTSB investigate the crash?
Well, they did - although it's not in fact their responsibility.
The NTSB's remit is to "conduct independent investigations of all civil aviation
accidents in the United States and major accidents in the other modes of transportation." (from the NTSB's website, emphasis mine).
The key thing to note is the word 'accident'. This is significant because the NTSB's analysis of an incident is inadmissable in a court of law - a rule intended to ensure the independence of their investigations. The idea is that they wil not be pressured by people fearful of criminal prosecution into fudging something in the report.
This also means, however, that when you're faced with a crash that is quite clearly the result of criminal activity, rather than an accident, the Attorney General can appoint someone else to lead a criminal investigation - in this case the FBI - to produce evidence which could be used in court.
Though the FBI led the investigation, they did request the help of the NTSB, due to their expertise. As the NTSB reported
on their website on September 13th.
quote:
At the request of the FBI, the Safety Board has sent investigators with knowledge of aircraft structures and flight recorders to the crash sites in New York, Pennsylvania and at the Pentagon. They are assisting in the search for the cockpit voice recorders and flight data recorders - the so-called "black boxes" - and helping to identify aircraft parts.