The following shows a diagram of a 767-200 overlaid on the Evan Fairbanks footage in After Effects, a video compositing program. By overlaying the 767 graphic over the plane the motion can be matched and any differences in speed of the actual plane will be reflected in the speed of the graphic overlay. After Effects shows the speed, in pixels per second, of a composited image in numeric and graphical form (highlighted in yellow).

Stefen Grossmann cites an MIT professor's analysis which claims that the plane would have lost about 25% of its kinetic energy in the collision with the building. The kinetic energy of a moving object varies as the square of its speed. If an object doubles in speed, its kinetic energy quadruples. The inverse is also true: if an object loses half its speed, its kinetic energy is quartered. Therefore, a loss of 25% of kinetic energy translates into only about a 13% loss of speed, assuming that the loss of kinetic energy is purely from reduction of speed and not also through the deformation of the plane's material.

As can be readily observed in the diagrams below, the plane DOES decelerate when it hits the building: a small amount when the nose hits and a larger decrease when the wings and engine hit the wall. While the plane is in the clear the speed of the matched graphic overlay averages about 612 pixels per second. By the point of the last possible measurement, when the tail is just outside the building, the speed has decreased to about 502 pixels per second. That means that the plane in the Fairbanks footage lost about 18% of its speed, which is even greater than what Grossman claimed should be visible.

The conclusion is undeniable: The Fairbanks footage shows a physically realistic impact. All this nonsense about "phantom" planes "melting" into buildings is just that: nonsense.