Already
in november 2001, 184 of the 189 dead at the Pentagon were DNA identified, including 63 of the 64 people on board flight 77 . This would mean that the remains of at least 63 people had to be planted at the Pentagon site, or that a lot of the "more than 50" specialists were part of the conspiracy.
By the way, the
debris of a plane (warning: large picture) has been planted very soon after the crash as well, according to this picture. Now I wonder: as soon as the crash happened, a lot of people started to arrive on the grass where this pic is taken. Were all of them in the conspiracy, or did none of them notice some Men In Black carrying this piece to this place and planting it there?
For the remains of the passengers and crew to be planted at the crash site so soon after the crash, they had to have access to the bodies. Crashing flight 77 into the ocean is thus not an option, so it has to be brought somewhere else. So a 757 lands somewhere unnoticed, the people on board are killed and maimed (burned and so on), the remains transported to the Pentagon, and planted there. Furthermore, the plane is made to disappear. All this has to be achieved with a minimum of people involved, as the larger a conspiracy, the bigger the chance that someone will blow the cover (or the whistle, if you prefer).
Is this, Turbonium, somehow what you have in mind?