In fact, the theory is that a piece of debris in photos of the scene is from a Pratt & Whitney JT8D jet engine in an A-3 Skywarrior attack plane. Unfortunately for this theory, it appears the JT8D was never used in the A-3 Skywarrior.
Another problem with Fetzer’s “JT8D Skywarrior” theory is that he has a web page asserting that no airplane at all, but rather a cruise missile, hit the Pentagon.
In today’s presentation, he suggested that maybe the “JT8D Skywarrior” fired a missile before it hit the building. (In reality, the A-3 Skywarrior, which is obsolete, has never been able to fire cruise missiles.)"
http://mu-warrior.blogspot.com/2006/07/kevin-barrett-james-fetzer-911.html
"In a typical statement, Wisconsin Rep. Steve Nass, a Republican, said: “This case isn’t about academic freedom. I firmly believe this is a case of protecting students from the academic garbage that Mr. Barrett spews.” He added that Barrett is “free to stand on the street corner and advocate his nutty left-wing views. However, the taxpayers and tuition-paying families shouldn’t pay this man one cent to perform his voodoo in a UW classroom.”
http://www.insidehighered.com/news/2006/07/03/madison
This clearly illustrates that 9/11 Truth is a psyop designed to make calls for an independent investigation look like the ramblings of psychotics.