Thought I'd add that:

Prior to the events of 9/11, (to the best of my understanding) US (and most other countries) procedure on hijacking was to cooperate with the hijackers, not fight them. Let them take control, stay alive, and wait for Delta Force or somebody deal with them AFTER the aircraft was landed some place. In general, 9/11 was about the first time, that I am aware of, where the hijackers actually took complete control of the flight controls and flew the plane instead of telling the pilots where to go.

The idea that the passengers and aircrew of an airliner would do something that violates [then] standing rules and would be considered inherently risky (fighting the hijackers) -- before it was burned into our psyche that letting hijackers take control of the aircraft could mean certain death -- is ludicrous.

And now...

So the material was easily planted in advance? So pray tell, when did they (the conspiracy) get their hands on the passengers (who would all or mostly have to be confirmed as taking the flight) in sufficient time to kill them before transporting their bodies (or the remnants with crash-type injuries or burned beyond rcognition) to the Pentagon, all undetected by the security and other workers there. It would certainly be noteworthy of comment (and inspite of orders to be quiet) if an area was cordoned off especially if it was the side hit by the airliner. This does not even ask about the engine parts and such and the real possibility that a miss by even a few dozen feet (or worse, the aircraft actually crashing early and then bouncing or skidding into the building) would have a significant impact on the way that the stashed bodies (or body remnants) and smashed pieces of the airliner get distributed around the crash site in what experts could think was a suspicious pattern. Certainly, it not being implied that the parts and bodies were completely pre-positioned in the the places where they should have ended up or is that the implication intended?

If, OTOH, it was all loaded on a robot(controlled) aircraft, then where are all the parts and pieces (and there would be many) of that robot aircraft?

More to the point, if the alternative of using a robot aircraft is to be considered viable then your contention that the "smoke cloud" in the video image that you claim is definitive or irrefutable evidence of the true events can't possibly be a fighter class aircraft like an F4 or F111 or another aircraft like the Global Hawk, now can it?