Because we all know that the FBI page is a legal document, right? Because if it is on the internet is must be true, right?
Building 7 fell after it had a building fall on it, then burning for several hours. Debris from the the falling towers severed/damaged critical columns and caused a fire that lead to the complete collapse of the building. Not to mention the 12,000 gallons of diesel fuel that was also in the building that fueled the fire.
The pentagon doesn't need cameras watching the highways and sides. The 2 videos we do have are from entry machine (where you insert a ticket in order to raise the barrier and enter the pentagon). Sure it is hazy, but the cameras were signed to take pictures of people and cars a few feet away and not Airliners traveling at over 500 miles an hour on the other side of the pentagon.
You misunderstand, while it is in fact restricted airspace, the problem your point is that at the time, US Military radars only monitored the airspace around the
borders because there wasn't the concept that there would ever be a real threat in the interior of the country. So the only systems that could of monitored the planes was the air traffic controllers, the problem was - that they needed the transponders of the planes to be turned on (the hijackers turned them off) to locate and identify them. It wasn't until 08:56 that the FAA had any idea that there was an emergency with AA77, but had no idea where it was. Dulles controllers detected AA77 but thought it was a fighter aircraft due to its high speed and sharp turns (not common on 757s). Reagan Airport controllers also detected the unidentified plane and asked a passing C-130 Hercules to identify and pursue the aircraft. The pilot of the C-130 located and identified that plane as either a Boeing 757 or 767 and probably from American Airlines (due to the colour of the fuselage), which was at about 09.30 - 7 minutes and 44 seconds before it impacted the pentagon. The C-130 followed AA77 and even witnessed its impact with the pentagon. So at most there was less than 8 minutes from when the plane was identified and located, that there could of been a response (not withholding the fact that they hadn't even confirmed if it had been hijacked or not), certainly not enough time to do anything meaningful.
The trajectory wasn't straight as you claim and was actually angled from the right (if you stand outside facing the pentagon);
The plane didn't only impact the first floor but also the second floor, so wherever you get your information from is pretty poor, guess we can't really rely on any of your other "facts" either right?
Believe it or not, reinforced concrete walls (or 6 of them) are not much of a barrier to an +250,000lb object traveling at +500 miles an hour. Also, despite most people's perceptions about reinforced concrete - the pentagon walls were not designed to survive such a significant impact.
