@gravity32
Trying to convince a 9/11truther (or whatever they are0 is like trying to convince any other believer. The best you can hope for is to remove a piece of evidence, but you'll almost never shake their belief.
if you did manage to produce a convincing argument to show that, for example, Boeing has altimeter calibration charts above Vmo which demonstrate that the altimeter was overreading, they'd just turn round and say something like "how convenient that NOW this is available to aid in the cover up".
Unless you like tilting at windmills ....