John Farmer, Senior Counsel to the 9/11 Commission (officially known as the National Commission on Terrorist Attacks Upon the United States)- From his book:
“at some level of the government, at some point in time…there was an agreement not to tell the truth about what happened... I was shocked at how different the truth was from the way it was described …. The [Norad air defense] tapes told a radically different story from what had been told to us and the public for two years. This is not spin.”