These are good questions. I am certain about two out of the three you mention. However, there is conflicting evidence in the Pennsylvania attack. On the one hand, we have pictures and video footage of a huge smoking crater. On the other, we have accounts of a debris field spread out over several miles. Was the crater faked? Who's been on the ground there to investigate?
"For example, does everyone agree that a Boeing 757 did NOT fly into the pentagon."
And exactly what kind of airplane do you think did hit the Pentagon? And DO NOT EVEN THINK of saying it was NOT an airplane!!! I WAS THERE digging out bodies of people STILL STRAPPED into their seats! You can think what you like..BUT after having been on the ground at the impact site as a firefighter on one of the first arriving fire engines I can tell you AN AIRPLANE HIT THE PENTAGON!!!
Welcome to the board, mikey. If you are a D.C. firefighter who was on scene at the Pentagon on 9/11/01, I can think of any number of radio talk hosts who would have you on the air to tell your story. Not the least of those is George Noory of Coast to Coast AM.
Coast to Coast AM will dig wide and deep to verify your credentials, and if they check out, I'm certain you will be on the program soon.
Dave von Kleist, producer of the film "911 In Plane Site" http://www.thepowerhour.com/press_release/press10.htm would be the first to welcome a challenge to his work, which shows that nothing wider than a Cruise Missile could possibly have struck the Pentagon. He'd also be the first to recant if he had good evidence from you to the contrary.
The DC FireDept was NOT the first on the scene! Arlington County, Va. was FIRST followed VERY closely by City of Alexandria, Va. units. I guess you did not know but the Pentagon is NOT in DC.