The day before 9/11/2001, Donald Rumsfeld announced that
$2.3 Trillion in transactions cannot be accounted for.
http://www.youtube.com/watch?v=xU4GdHLUHwU

The Pentagon wing with the Accounting records was destroyed on 9/11.
How convenient. So we will never know where the money went.

How can we get a feel for how much $2.3 Trillion is?

The Moon is an average of 384,403 km from Earth.
That is 384,403,000 meters (384 million meters)
That is 384,403,000,000 millimeters (384 billion)

If the thickness of a US Dollar is about 1 millimeter,
that means you could stack 384 billion dollars to the Moon.

$2.3 trillion or $2,3000,000,000,000 would stack dollar bills
2.3 trillion / $384 billion = 6 times to the Moon

As many times as NASA landed on the moon. (Yes they did.)

A lot of murders have been done for much less money.
If 9/11 was an inside job, it wasn't done for small change.