Watch Online Free FlixHQ. More than two decades after the September 11th attacks, chilling new claims are surfacing about a possible fifth plane intended to strike. While four hijacked planes carried out the devastating attacks, new information suggests another aircraft may have been part of the original plot — one that never reached its target. Was it grounded in time? Covered up? Or simply forgotten? This investigation digs into government documents, eyewitness accounts, and hidden details that may point to a fifth plane… and a deeper conspiracy.