The North American Aerospace Defense Command (NORAD) practices for dealing with the simulated hijackings of two commercial aircraft by terrorists, as part of its annual training exercise called Vigilant Guardian. Whether the simulated hijackings take place simultaneously or at different times of the day is unclear. [9/11 Commission, 2004; Spencer, 2008, pp. 3]

Terrorists Threaten to 'Rain Terror from the Skies' - One of the two exercise scenarios involves the hijacking of a Boeing 747 bound from Tokyo, Japan, to Anchorage, Alaska. According to a document later produced by the 9/11 Commission, the scenario involves the “[t]hreat of harm to [the plane’s] passengers and possibly [a] large population within [the] US or Canada.” It includes what is apparently a fictitious Asian terrorist group called “Mum Hykro,” which is threatening to “rain terror from the skies onto a major US city unless the US declares withdrawal from Asian conflict.” During the hijacking scenario, some of the plane’s passengers are killed. The plane’s course is changed to take it to Vancouver, Canada, and then to San Francisco, California. In response to the hijacking, the chairman of the Joint Chiefs of Staff and FAA headquarters direct military assistance, in the form of “covert shadowing” of the hijacked aircraft. NORAD has to liaise with the appropriate air traffic control centers. Its Alaskan region (ANR) and its Canadian region (CANR) participate in the scenario.

Group Threatens to Blow up Plane - In the other hijacking scenario, 10 members of another fictitious terrorist group, “Lin Po,” seize control of a Boeing 747 bound from Seoul, South Korea, to Anchorage. The hijackers have weapons on board that were smuggled onto the plane in small tote bags by ground crew members prior to takeoff. Gas containers were also smuggled onto the aircraft by baggage handlers before takeoff. Arming devices are attached to these containers, which can be remotely detonated. The terrorist group issues demands and threatens to blow up the plane if these are not met. The CIA and NSA caution that the group has the means and motivation to carry out a chemical and biological attack. The group kills two of the plane’s passengers and threatens to use the gas it has on board in some manner. In response to the simulated hijacking, NORAD directs fighter jets to get in a position to shoot down the hijacked airliner, and orders ANR to intercept and shadow it. In the scenario, the 747 eventually lands in Seattle, Washington. [9/11 Commission, 2004]

Most NORAD Exercises Include Hijack Scenario - Vigilant Guardian is one of four major exercises that NORAD conducts each year. Most of these exercises include a hijack scenario. [USA Today, 4/18/2004] Ken Merchant, NORAD’s joint exercise design manager, will tell the 9/11 Commission in 2003 that he cannot “remember a time in the last 33 years when NORAD has not run a hijack exercise.” [9/11 Commission, 11/14/2003 ] This year’s Vigilant Guardian will include additional aircraft hijacking scenarios on September 9 and September 10 (see September 9, 2001 and September 10, 2001), and a further simulated plane hijacking is scheduled for the morning of September 11 (see (9:40 a.m.) September 11, 2001). [9/11 Commission, 2004; Vanity Fair, 8/1/2006]