Parts of them were tangled up with the towers when they collapsed, but I also saw one of the jet engines ripped off and landed in a nearby street on a documentary.

They showed a photo of this engine and people standing around it with their faces in disbelief, as you can imagine.

The remainder of the planes presumably were buried along with the rest of the rubble when it was removed for examination in a specially designated area away from Ground Zero. 100% 1 Vote