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.
No it was a missile. What hit the towers was a missle and pre planted explosives. Aluminum planes can't slice through steel like butter, if they're traveling that low at that speed it's a miracle that the wings aren't ripped off