Probably nothing..

The documentary is called September clues

I don't believe the no planes theory but this is weird I will give it that.

September clues goated documentaries

why would someone create fake footage to overlay that had the plane going behind the building and then reappear again if it never needed to show on the other side of the building? the cutoff would just be to the right of building.

Is this not just a news channel trying to add the graphics for a recreation?

THERE WERE NO PLANES. NONE.

also focus on how the plane image is cut off in the middle of the air

I remember this and have actually been looking for it so I could battle the zombies with it. Ty!