Uncovering the Mystery of the Alleged Fifth 9/11 Plane.

The captain of United Flight 23, which was grounded at JFK airport on 9/11, believes his plane was intended to be a fifth aircraft in the terrorist plot. Tom Mannello believes a ground crew assisting the terrorists got the wrong plane, thwarting any attempted attack. United 23 did not feature in the official report of the 9/11 Commission, and there were never any confirmed arrests of those on board. The crew were interviewed by the FBI and four passengers traveling in first class were reported as behaving suspiciously, but no one was ever arrested.