I think I'll do a time warp and look at that a little ...
I didn't pay much attention when it happened.
We are talking about the “Let's Roll” flight 93 ? right?
I would guess everything has been pretty well scrubbed by google by now, but some of it is still out there all "fact checked" for you , so you don't have to worry about being accused of being insane for even thinking it could be possible.
I am not eager to jump to the entire conspiracy theory, but I was shocked when I found out and it really got me thinking how it could have been pulled off by a very small group on the ground ( the people on board would be thinking they were being hijacked by terrorists) . I even saw the thing about remote flight control "capabilities" on Wikipedia as well as other places and about why other nations got rid of the planes
often I do esoteric searches on a subject as it is happening or soon after an event and then watch the info disappear or change over time by what comes up in a search (Benghazi was a good example of this)