My friend is one of the founders of a group called "9/11 Citizens Watch". They are the group of the families of 9/11 victims, the ones who pushed for the commission to be formed to investigate 9/11.
He has been present for all the commission's hearings, as well as has seen much of the evidence, and has done lots of investigating along with the group.
I can tell you that there are many holes in the government's story, but the one posted in this thread is just absurd. However, this is the one that keeps getting thrown around in the media, which makes me think that this was intentionally put out there to discredit anyone who questions the official story as a kook or crazy person.
It's like reading in the New York Times a couple years ago that some conspiracy theorists believe that JFK was murdered by aliens. Kind of gives the impression that everyone who believes in a conspiracy is a nut.
But conspiracies do occur all the time, and sometimes governments are involved in them. About 60 years ago, somehow, the government of a European country managed to systematically murder 11 million people in concentration camps without over 90% of their own population being aware of it. Even today, many Germans believe the holocaust never happened. If the Nazis had won WWII and were still in control of Europe, I'm sure most of the world would believe the story of the holocaust was just some big "conspiracy theory".
9/11 is a conspiracy however you want to look at it.
Conspiracy means that it involved more than one person. Most people seem to believe that a bunch of muslim extremists living in caves in Afghanistan were responsible. But very few believe the American intelligence agencies with $40 billion per year budgets could pull off the same thing.
What I can tell you is that the 9/11 conspirators, whoever they may be, had inside help. Whether or not this went to the top levels of our government has yet to be investigated. But about 100 different things had to go wrong in the months prior and on that day for their plan to succeed. About a dozen government agencies had to make mistakes, do things against policy, fail to follow proper procedure, etc, and this includes members of the Bush Administration. Whether or not you want to argue that it was intentional or just plain imcompetence is a debate for another time.
As far as the plane hitting the Pentigon, of course it did. Maybe what you should wonder about is why it was not shot down. Why Andrews Air Force base, which is 10 miles away, failed to deploy a single fighter that morning until after the plane hit, even though they knew the plane was hijacked and coming towards Washington for about a half hour. Or why they did not use the surface to air missles located around the Pentigon itself.
It's certainly a sad day when our $400+ billion per year Military cannot even protect their own building from an attack.