10:15 a.m. September 11, 2001: NORAD Sectors Told Peacetime Rules of Engagement Still Apply

A message is put out on NORAD’s computer chat system, notifying its three air defense sectors in the US that peacetime rules of engagement (ROE) still apply, which means fighter jets are not permitted to shoot down hostile aircraft. As a 9/11 Commission memorandum will later describe, on the chat log it is reiterated at this time “that the defensive posture [is] still peacetime ROE.” The person or organization that issues this message is unstated. NORAD’s computer chat system allows those with the proper access to communicate with each other, similarly to the way members of the public do in Internet chat rooms. The NORAD system includes three main chat rooms. The message about the current rules of engagement goes out in the chat room for the Continental US NORAD Region (CONR). This is where CONR’s three sectors—including the Northeast Air Defense Sector (NEADS), which has been coordinating the military’s response to the hijackings—communicate with each other. [9/11 Commission, 1/22/2004 ; Spencer, 2008, pp. 139] It is not until 10:31 a.m. that Major General Larry Arnold, the CONR commander, will issue an instruction over the chat system, stating that NORAD has been cleared to shoot down threatening aircraft (see 10:31 a.m. September 11, 2001). [9/11 Commission, 7/24/2004, pp. 42]