One thing truthers don't keep into account -- and I know it's been said before -- is that high-speed impacts have extremely counter-intuitive effects. I recently watched a Mythbusters episode where they crushed a car with a rocket sled. I took special notice of this because the car they used was the exact model that I drive.
One would expect a car being crushed to crumple from a large mass into a smaller, denser one. However, that isn't what you see on the high-speed film. It showed no crumpling at all; the car just disappeared little by little, as if it were being consumed by the rocket sled.
Examination of the aftermath showed that it hadn't in fact disappeared, but was reduced to tiny pieces of wreckage strewn all about the area. It certainly didn't look like it used to be a complete car, but...there it was.