I saw a video on youtube a long time after the fact. A "little known" angle of the attacks shot from a helicopter. In this video the towers are dead center in the shot when the plane hits. You can see the nose of the plane portrude through the tower as the camera angle slightly drifts from being centered on the towers. The theory goes that it's a "infographic" programmed to fly the "plane" to the middle of the screen being shown on that camera, then disappear. Since the helicopter drifted the angle so the towers were slightly off-center, the "plane" graphic flew a little further than it should have and is visible out the other side of the tower. It's interesting because if you draw a center-line on the shot, the nose portrudes through exactly to the amount that it would need to, to be centered. I bet the video is still out there somewhere