AA77 was hijacked sometime between 8:51 AM (when the last routine radio communication from the plane was received) and 8:54 AM (when the radar transponder was turned off). The Pentagon was hit at 9:37 AM.
That gives the eevil gummint conspirators a maximum of 46 minutes to land flight 77 somewhere secret, remove the passengers, kill them, fake the effects of a high-speed crash on the bodies, load the bodies onto another plane, fly to Washington, transfer the bodies to road vehicles, drive them to the Pentagon and then plant them, along with the FDR and engines, landing gear and other debris, in locations consistent with the damage done to the building, at a disaster scene swarming with people, none of whom noticed this activity going on.
One of the things to remember is the unusual construction of the support columns in the building. Orginally the building was only going to house the military for the duration of WW2 then be turned into a records repository afterwards.
As such the building was constructed to take the enormous weight of thousands of full filling cabinets.
The other thing to remember when looking at photos. There are no actual images of the hole. When the impact occured the area was obscured by fire smoke etc. A little later a section of the second floor collapsed into the breach. So what you see after the event is nothing like the orginal damage
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--Mobilis in Mobili--
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