TMZ alleges there was a fifth plane on 9/11 that was covered up by the FBI.

In a documentary, TMZ interviewed 3 flight attendants and the pilot who were on United Flight 23.

After being evacuated from the plane, the pilot says they later found that the hatch on the bottom of the plane had been opened.

"The airplane was locked and sealed when I left the airplane, so something else was going on that I couldn't explain."

The flight crew said there were four "Arabs" on the plane who demanded that the flight take off when flight attendants tried giving them food.

One of the men had requested to see the cockpit before takeoff.

The crew says they were interviewed by the FBI, but never heard back, and never found out if the men were questioned or not.

"We have requested information about Flight 23 ... we did not get a reply," TMZ said.

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This documentary is 2 years old.
https://www.imdb.com/title/tt27210489/

The FBI acknowledged an investigation into an attempted hijacking of a fifth plane on 9/11 in a Florida newspaper in 2022 and 2023. This wasn't covered up.
https://www.floridabulldog.org/2023/07/fbi-acknowledges-active-investigation-attempt-hijack-fifth-flight-9-11
https://www.floridabulldog.org/2022/09/much-about-9-11-still-unknown-like-full-story-of-united-flight-23%EF%BF%BC/

The 9/11 Commission did investigate Flight 23
https://s3.amazonaws.com/NARAprodstorage/opastorage/live/90/6106/2610690/content/arcmedia/9-11/MFR/t-0148-911MFR-01090.pdf