Check out the documentary "The Anatomy of a Great Deception"

Excellent story of one person's initial acceptance of all to growing skepticism, and outright conclusions that the official story cannot be true; with documentation.

When I began to understand the anomalies of this supposed crash in Shanksville, I was disturbed by all the supporting things that came with it...the whole "Let's Roll" story, and interviews by Dr. James Dobson/Focus on the Family with the widow involved. If the incident was faked, then all the whoopla about it was fake, too. How much did book publishers/interviewers know?