hi doma,
i looked at those charts. i think they log actual flight plans and recommended mach numbers. which is nice information.
but i don't see that they have anything to do with aircraft maximum velocities or shock wave equivalency values.
we already know that the world trade centre flyers were not obeying instructions. they were flying outside guideline limits.
so the question is, are the aircraft capable of doing so? the answer is yes. why? because the shock waves are the same at 2,000 feet as they are at 35,000 feet for the equivalent mach number. as nasa confirms. so long as the plane can produce the thrust, they can reach the required velocity. and the simulator, which is set to match the aircraft's actual capabilities, was able to replicate the 9/11 flyers' flight plans.
so i'm afraid that it is very clear that 510 knots was doable. which isn't surprising since everyone saw what happened. a commercial jet flew into the world trade center. and then another. this is called evidential reasoning. the observations match the theory.
your desire to believe in the conspiracy is leading your willingness to accept the evidence.