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The Plan for the Security Control of Air Traffic and Air Navigation Aids (SCATANA) is an emergency preparedness plan of the United States which prescribes the joint action to be taken by appropriate elements of the Department of Defense, Federal Aviation Administration, and the Federal Communications Commission in the interest of national security in order to effectively control air traffic and air navigation aids under emergency conditions. Known versions of the plan are dated June 1971 and August 1975. The plan implements parts of the Federal Aviation Act of 1958, the Communications Act of 1934, and Executive Order 11490 of October 28, 1969 (amended by Executive Order 11921 on June 11, 1976).
The U.S. plan has been implemented exactly once (other than tests) since its inception. On September 11, 2001 the codeword was broadcast ordering that all U.S. air traffic be grounded, after the September 11 attacks. Even in that instance, the emergency plan was only partially implemented as the Defense Department left command and control of the air traffic system with the FAA and intentionally allowed all radio navigational aids to remain in operation to aid in the process of controlling and landing the thousands of planes which were aloft in domestic airspace.
Several people have been credited with issuing the SCATANA order for a national ground stop. The 9/11 commission credits FAA National Operations Manager Ben Sliney with issuing the directive after he witnessed United Airlines Flight 175 crash into the south tower of the World Trade Center.
Military exercises known as Operation Skyshield had temporarily closed U.S. airspace to civilian traffic in the early 1960s.
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