What was the chief bureaucratic flaw identified by the National Commission on Terrorist Attacks on the United States?

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The National Commission on Terrorist Attacks on the United States (also known as the 9/11 Commission) identified a major flaw in the bureaucratic system of communication between domestic and foreign security agencies. This flaw allowed the 9/11 hijackers to enter and remain in the United States undetected, and ultimately carry out the attacks. While there were other flaws identified, such as intelligence failures and airport security weaknesses, the lack of communication between agencies was a central issue.

What Was the Chief Bureaucratic Flaw Identified by the National