The testimony of former transportation secretary Norman Mineta.

If you think the 9/11 Commission's "investigation" was legitimate, you need to expand your information horizons. Reams of very important, very relevant testimony that occurred before them was completely ignored in their final report. For example, the testimony of former transportation secretary Norman Mineta.
the testimony of former transportation secretary Norman Mineta

Mineta was in the Presidential Emergency Operations Center with Dick Cheney on the morning of 9/11, as the craft that eventually struck the Pentagon approached. Here is an excerpt from his testimony:

"There was a young man who would come in and say to the vice president 'the plane is 50 miles out'...'the plane is 30 miles out'...and when it got down to 'the plane is 10 miles out', the young man also said to the vice president 'do the orders still stand?', and the vice president turned and whipped his head around and said 'of course the orders still stand. Have you heard anything to the contrary?'"

Given the undisputed reality that whatever was approaching the Pentagon did indeed eventually hit the building, what could those orders possibly have been, except to NOT shoot down that aircraft? And if this is the case, why was it NOT shot down?

A legitimate 9/11 Commission would have wanted to explore this question in depth. Instead, the issue was dropped and Mineta's testimony was not mentioned in their final report.

Quite interestingly, Mr. Mineta very quietly resigned his position in June of this year, the day after James Fetzer, Co-Founder of Scholars for 9/11 Truth made this appearance on Fox News Channel's Hannity and Colmes program. Perhaps it was divine intervention that had Oliver North sitting in for hapless Bush parrot Sean Hannity that evening, which allowed Fetzer to actually complete a few sentences without being repeatedly drowned out by childish Hannity rants.
Mineta resigned after this interview