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'9/11: The Fifth Plane' Pilot, Flight Attendants Convinced ... Their Flight Was Targeted By Hijackers

A 6-month TMZ investigation raises serious questions ... was there a 5th plane targeted by hijackers on 9/11? The flight attendants and pilot aboard United Flight 23 believe they were indeed targeted, and they make their case tonight on FOX at 9 PM.

United 23, a 767 aircraft, was scheduled to depart JFK at 9 AM, bound for L.A. Six passengers aroused the suspicion of flight attendants for various reasons. Among them ... they were convinced one of the passengers was a man disguised as a woman.

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The plane was near the runway, ready to take off, when JFK was abruptly closed after the World Trade Center was hit. It taxied back to the gate and the plane was fully evacuated and locked. Twenty minutes later, people on the ground saw 2 uniformed people running in the passenger cabin. Authorities came, unlocked the door, and found the hatch leading from the belly to the cabin was open ... something that alarmed the FBI.

The flight attendants were interviewed by the FBI and even taken to a lineup to see if they could identify the 4 passengers.

Box cutters were found in the first-class seat pockets on a 767 parked next to United 23 ... that plane was not scheduled for takeoff at the critical time. The pilot was informed and believes those box cutters were meant for his plane, and someone on the ground just confused the 2 planes.

In addition to the flight attendants and pilot, the documentary includes interviews with the United dispatcher, a member of the 9/11 Commission and others.

"TMZ Investigates 9/11: The Fifth Plane" airs tonight on FOX at 9 PM ET.

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