Was this the FIFTH 9/11 plane? Crew of United 23 reveal their 767 was raided by FBI and grounded

The captain of a United Airlines flight due to take off from New York’s JFK airport on the morning of 9/11 has said he believes his plane was intended to be a fifth aircraft in the terrorist plot.
Tom Mannello was sitting on the tarmac in the cockpit of United Flight 23 at 9am, waiting to take off, when air traffic control ordered all flights back to their gates.
‘There is a good chance that somebody was plotting to try to use our airplane as a weapon of mass destruction,’ he said on TMZ INVESTIGATES: 9/11: THE FIFTH PLANE, which airs on Monday at 9pm ET on Fox.
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. U.S. officials have not commented on the years of speculation about the flight being a possible fifth plane planned for attack.
September 11, 2001, remains the deadliest terrorist attacks in American history, and saw 2,977 people killed in four separate attacks.
Four planes crashed that morning.
American Airlines Flight 11 took off from Boston bound for LA, and crashes into the World Trade Center’s North Tower at 8:46am.
United Airlines Flight 175 also took off from Boston, 15 minutes after the AA flight, heading for LA: it crashed into the WTC’s South Tower at 9:03am.
Source of data and images: dailymail