The security of the nation's commercial aviation system has been a long-standing concern. Following the events of September 11, 2001, Congress enacted numerous aviation security improvements designed to strengthen aviation security, including the development of a passenger prescreening system and the federalization of airport screeners. Despite these changes, challenges continue to face the Department of Homeland Security (DHS) and the Transportation Security Administration (TSA) efforts to improve aviation security. GAO was asked to summarize the results of previous and ongoing aviation security work. These include: (1) the development of CAPPS II to assist in identifying high-risk passengers, (2) the management of passenger and baggage screening programs, (3) the operations of the Federal Air Marshal Service, and (4) other aviations security related efforts, such as cargo, that remain a concern.
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