I don't know. Why didn't they investigate 9/11?

Well the plane that crashed in Pennsylvania vaporized due to swamp gas in the lower atmosphere.

The plane that hit the Pentagon created a rift in the space time continuum which allowed most of it to pass through the building, while the rest of the plane did little damage and made that tiny hole. The remains of the plane still trapped between worlds quickly lost it's quantum frequency timing and shifted it's polar magnesium temporal order resulting in a ghost effect where it was stuck in limbo. Half the plane is still there on this Earth. It is just not able to been touched by our physical bodies or seen by our eyes or limited technology.

The jet fuel melted it all.

they found it here https://upload.wikimedia.org/wikipedia/commons/a/a4/Twa_800_flight_path.png

They recovered all of that from the ocean and glued it back together on land, but yet they were unable to do that with any of the 4 that completely crashed on land?