Doesn't the mere fact that the FDR was found inside the pentagon self-debunk any claims that the plane flew OVER the pentagon?
It seems to me that if the box is recovered at point X.....and the data from the box indicates that said box is at point Y....then the data indicating point Y must be incorrect.
Practical example:
Car's gas tank shows a full tank....but after a minute or two on the road, the car runs out of gas, confirmed by checking the tank and seeing that it's empty...gauge still shows full.
Truther: The gauge says full, so we couldn't have run out of gas.
Reality: Gauge is wrong.