Why didn't the airlines ever rebuild [View All]

Flight 93 or Flight 77.

This is standard operating procedure that has part of the crash investigation, even when they already know the cause, they still try to rebuild the whole plane.

Whole planes that crash into the ground or low buildings don't just disintegrate and disappear. There is always debris and lots of it. Even in Flight 800 (for one example) they were able to reconstruct almost the entire plane and eventually recovered every passengers remains and that was in the ocean and the crash had a lot of fire.

So where are the planes. There have been no reports since 9-11 of any aspect of the investigations that are supposed to happen after every crash? Why not?