The plane material captured by the building will tend to follow the debris flow of the building components that it is embedded in. Each floors components will TEND to end up at different radius' from the footprint of the building. Different floor materials will have statistically significant possibilities of being distributed in a roughly predictable pattern.
At least one engine and a landing gear, probably from the nose, were ejected and came to rest over on Murray Street. This is predictable, since they are very dense and heavy. One landning gear wheel was found wedged between two elements of a panel of perimeter columns. I shall attempt to find pics of that one for you.
The large piece of fuselage was probably pressed up against the wall after the crash, then just shoved aside by the falling debris during collapse.
The majority of the aluminum from the aircraft would have been shredded badly on impacts with various strctural components and might already not have been precisely identifiable even before the collapse. Bear in mind the fire fighters' remarks about not finding even an identifiable chair.
During collapse, we have thousands of whirling axe blades further shredding materials of all sorts. This does not bode well for the survival of the black boxes.
Being housed in the empanage, the boxes would probably not have made it very far into the interior of the buildings, since a great deal of kinetic energy had been expended already when they entered the structures. They probably came to rest in the middle of the storm of grinding objects that fell down the inside of the tubes.
The chances of their having been pounded beyond recognition are running pretty high already.
Now, to go back to the sand analogy, the debris from the crush zone would have been among the first shoved off to the side, and not very far, at that. As the mass of debris accumulates, the dust plume can be seen to be widening.
Now we have an enormous proportion of the building falling on top of the boxes.
The story of the FBI recovering any identfizble piece of any of them sitting near the top of the pile now looks like a total crock of BS.
Mostly, the boxes would have been ground between floor slabs. It is a bit like a soft boulder the size of your head spending a couple hundred years being dragged along under a glacier. Not much will survive in a recognizeable shape.
Now, being on the bottom of the pile, they are subjected to fires that burn several hundred times longer than those they were intended to survive.
The debris field is a little less chaotic now.
Unfortunately for some special interests, it even more clearly shows that aircraft parts that were not ejected durig the crash are probably not going to be recognizable. Most of the components would have looked like as bit of wire harness or parts of somebody's boom box.
Did I mention that a large part of anything made of aluminum would have melted in the fires under the pile?
Softer items. such as leather brief cases and wallets survived because they could not shatter. Pieces of bone smaller than an inch long are still turning up in some of Rotten Rudy's pot hole patches.
Most of the initiator train for installed exlosives woud be most of copper components less likely to be destroyed in the cololapses. They would have been notice as something that should not have been there when the forensic specialist and fire fighters on the pile and at Fresh Kills.
