Where is the wreckage of the pennsylvania crash? Where is the wreckage of the pentagon plane.
No force known to man, and espcially a force from a massive plane collision will separate the strong and weak nuclear forces, which means fragments of metal, even from a totaly destroyed plane would still be left over.
There were no plane fragments at the pentagon and there were none at the penn. site.
One picture that was not confiscated was pentagon agents out in the pentagon yard picking up medium sized pieces of metal right after the missile hit the pentagon.
Now, that whole yard has been dug up and the dirt replaced and paved over, making further forensics impossible.