I remember back in the day (9/11) a guy named David Hawkins (now with Abel Danger) theorized that the 9/11 planes were all flown remotely.
There was a second airplane in Shanksville, with a t-shaped tail wing, that indicated it was a bombardier or something.
https://www.apfn.net/messageboard/03-09-07/discussion.cgi.60.html