It would seem very difficult to crash an airliner into such a low building. Also there is no footage of the impact only the aftermath.
On the other hand it seems equally unlikely that a plane crash could be faked and you are able to set up that aftermath scene without any of the public seeing a set being set up.
Not a whole lot of people filming at the time as nothing had happened yet. That said, here's a video of the plane hitting the 1st tower:https://youtu.be/miA8Td4oNcY
The pentagon is a different story. Good luck getting more than literally 2 frames.