9/11 was a Heist, Coup, Distraction & Domino Effect. It should be called "Oceans 9/11" because many different groups were involved.
1) Heist [The Gold & Silver in/under Ground Zero & all those Trillions that "Vanished"]
2) Coup [Jets were moved to be out of position so they couldn't intercept anything & Building 7 being destroyed due to who/what was operating in it]
[Pentagon being hit is very interesting, since it happened to an area that was specifically reinforced almost like a bunker. Which means the Pentagon strike was either "sending a message", a counter strike against those in there, or a false flag done by those inside it to look like they were also the "victims".]
3) Distraction [Look at what else was going on that day around the world & in the US, also what followed in the months after(such as how China joined the WTO in December)]
4) Domino Effect. [It was a result of previous Domino Effects, and created a Domino Effect of its own]
Groups involved in 9/11:
1) Mossad [In 2 different ways, a rogue group that was part of the 9/11 operation & a separate group who was trying to stop the rouge group and the Saudi's]
2) Saudi's [Funding for the fall guys(hijackers)]
3) Deep State ["Intel", Drones, Logistics, Help with planning, etc]
4) MSM/Hollywood [Provided "Plane" footage to be shown on TV/Media(Planes on TV/Media were not real)]
5) Al-Q[Agreed to take the blame for it & keep the "Bin is Alive" thing going.(As a "reward" they got more arms/cash shipments(likely from the CIA) that would be used lately on for things like Syria)]
6) M.I.C. & Contractors[They wanted war & also helped with the quick "Clean up" of Ground Zero(Dump Truck/Heavy Machinery Convoys for instance)]