There are two very persuasive arguments that it wasn't a plane. One, no video of it. Two, the highjackers trained on how to fly, NOT how to land. That plane would've had to land at precisely the correct spot to hit that shortish building that perfectly. Think of how hard that would be. And it wasn't like it was trying to adjust at the last moment because there was no evidence that one wing hit first and made the plane tumble or anything. It was a perfect descent to the perfect spot. C'mon, man!