Regarding the 4 crashes on 11 September, there was never a normal NTSB investigation. That agency was relegated to the sidelines, as the Pentagon and other federal agencies took over. The NTSB did file final reports, but they were not up to usual standards, and amounted to little more than a whitewash. They were merely NTSB contributions to the federal suppression of evidence and coverup of crimes.
The crash sites of the four 9/11 aircraft were crime scenes not aircraft accidents and that determines who will investigate the crime scenes. I have recently told you that if you didn't know, then it is better to remain quiet rather than opening up and letting everyone know how much you don't know. Since it is obvious that you didn't know, I will help you out.
The National Transportation Safety Board (NTSB)
The NTSB is an independent federal agency charged by Congress with investigating every civil aviation accident in the U.S. and significant accidents in other modes of transportation-railroad, highway, marine and pipeline.
Edited by skyeagle409, 16 December 2012 - 05:47 PM.