I've heard many theories as to what happened at the World Trade Center. As to the general outline of what happened on 9/11, I think I'll start with the general outline of both the official narrative of events, as well as the generally accepted outline of what those who disagree with it is, as outlined in a documentary film called
Zeitgeist...
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19 hijackers, directed by Osama Bin Laden, took over 4 commercial jets
with box cutters and, while evading the Air Defense System (NORAD), hit
75% of their targets. In turn, World Trade Towers 1, 2 & 7 collapsed due
to structural failure through fire in a "pancake" fashion, while the
plane that hit the Pentagon vaporized upon impact, as did the plane
that crashed in Shanksville. The 911 Commission found that there were
no warnings for this act of terrorism, while multiple government
failures prevented adequate defense.
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I would like to ask anyone who sides with the official narrative if they essentially agree with this narrative..
Yes, I do. Evade NORAD? Do you even know what NORAD does and how the US air traffic control system works? It's not like they flew those planes from Russia.
Well, atleast you aren't assuming that I'm some villainous know it all that is hiding information to further his nefarious claims

. I think the director of Zeitgeist did a pretty good job in his documentary, but he may have not been up to snuff on the fact that the FAA's ARTCCs handled air traffic within the U.S.
As for conspiracy theories, the problem with them is that most not only take hundreds, if not thousands of people to carry out, but for all of those people to never, ever speak of it.
Have you ever heard of information security compartmentalization? Just in case you haven't:
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In matters concerning information security, whether public or private sector, compartmentalization is the limiting of access to information to persons or other entities who need to know it in order to perform certain tasks.
The concept originated in the handling of classified information in military and intelligence applications, though it dates back to antiquity, and was used to successfully keep the secret of Greek fire.[1]
The basis for compartmentalization is the idea that, if fewer people know the details of a mission or task, the risk or likelihood that such information will be compromised or fall into the hands of the opposition is decreased. Hence, varying levels of clearance within organizations exist. Yet, even if someone has the highest clearance, certain "compartmentalized" information, identified by codewordsreferring to particular types of secret information, may still be restricted to certain operators, even with a lower overall security clearance. Information marked this way is said to be codeword–classified. One famous example of this was the Ultra secret, where documents were marked "Top Secret Ultra": "Top Secret" marked its security level, and the "Ultra" keyword further restricted its readership to only those cleared to read "Ultra" documents.[2]
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Source:
Compartmentalization (information security) - Wikipedia, the free encyclopedia
Using compartmentalization, while many people may have unwittingly participated in 9/11, most of them didn't actually need to know what was truly happening. Of those who were likely to figure it out after the fact, they were probably killed. Some if not all of those killed may have later been said to have died as passengers on the doomed flights, or actually died at the Pentagon and WTC buildings. I definitely believe some near the very top had to have known what was going on. Here's a small clip from the pilot episode of an Xfiles spinoff that gets the gist of it:
One last thing: some witnesses on 9/11 may have been deemed to know 'too much' and thus killed off. There is evidence that this has occurred: