9/11 conspiracy theorists reject one or both of the following facts about the 9/11 attacks:
• Al-Qaeda suicide operatives hijacked and crashed See more

Since the attacks, a variety of conspiracy theories have been put forward in websites, books and films. Many groups and individuals advocating 9/11 conspiracy theories identify as … See more

Foreknowledge
Conspiracy theorists claim that action or inaction by U.S. officials with foreknowledge was intended to ensure that the attacks took place successfully. For example, Michael Meacher, former British environment … See more

Pax Americana
In September 2000 the Project for a New American Century (PNAC) released a strategic treatise entitled Rebuilding America's Defences. … See more

The most prominent conspiracy theories can be broadly divided into three main forms:
• LIHOP ("Let it happen on purpose") – suggests that key individuals within the government had at least some foreknowledge of … See more

Cockpit recorders
According to the 9/11 Commission Report, both black boxes from Flight 77 and both black boxes from Flight 93 were recovered. Flight 77's CVR was said to be too damaged to yield any data. On April 18, 2002, the FBI … See more

Conspiracy theorists often point to Operation Northwoods as a model for the 9/11 attacks, theorizing the attacks were carried out by the U.S. government as a false flag operation … See more