More than a decade later, a New York City building inspector saw twisted metal wedged in a silver of space between two buildings, which turned out to be a piece of debris from the Sept. 11 terrorist attacks.
Police contacted officials at Chicago-based Boeing Co. and confirmed the rusted wreckage was from a Boeing 767. Police said the identification number was clearly visible on the landing gear. The area is being treated as a crime scene, and on Tuesday, a medical examiner will begin searching for human remains.
The American Airlines and United Airlines planes that slammed into the Twin Towers killing 3,000 people were both Boeing 767s, but Boeing could not identify from which plane the wreckage fell.
The wreckage is now sparking hope for some families who are looking for closure.
The piece of the plane is about five feet long and four feet wide. Police released a sketch of where it was found in the back of these buildings.
On Friday, New York Police Commissioner Ray Kelly admitted that they still don't know how the part got there.
"Could it have been lowered at some time? It's possible. There's a rope that's on it, looks like it's intertwined with that part," Kelly told FOX 5 News in New York.
As police continue to investigate, New Yorkers say some families get much needed closure.
"It's at peace for the people who lost their loved ones," a New York woman said. "Now they can really be assured that they know where the remains are."