its not the first time in the US history come up with such think as 911. Ever heard of operation Northwoods? the documents was declassified in April 2001 Brain child of CIA and singed of on by the Joint chiefs of staff. here is snippet
Operation Northwoods proposals included hijackings and bombings followed by the introduction of phony evidence that would implicate the Cuban government. It stated: "The desired resultant from the execution of this plan would be to place the United States in the apparent position of suffering defensible grievances from a rash and irresponsible government of Cuba and to develop an international image of a Cuban threat to peace in the Western Hemisphere."