I have always argued that it is the general claim that the plane was on the north side at all that proves a deception and it would be unreasonable to expect any witness to be mathematically accurate when illustrating any specific flight path.
In other words we can not accurately determine all the necessary values to compute the math based on eyewitnesses who can only be relied on for general claims as made clear by Sgt Lagasse in this important quote:

But the demands for math persisted and Pilots for 9/11 Truth have met those demands with flying colors!
Watch this new 19 minute scientific presentation:
9/11: THE NORTH FLIGHT PATH: Aerodynamically Possible - Witness Compatible
