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<p>The vulnerability of the Aviation Transportation System was once again  highlighted on September 11, 2001. Hijacking was not a new phenomenon in aviation; it  erupted in the late 1960s, hijackers used commercial airliners for transportation to Cuba.  The hijack incidents slowly became more violent. Aviation security legislation and  measures were championed after each major aviation hijack incident, but they were not  always fully implemented. What was the status of aviation security leading up to 9/11?  Have the improvements made to the Aviation Transportation System since 9/11 made the  system less vulnerable?  This thesis presents a comparative study of domestic aviation security measures  applied to commercial passenger aviation. Security initiatives, the implementation of  those initiatives, and security policies both pre and post 9/11 are described and examined  in an effort to determine if the domestic Aviation Transportation System is more secure  now than it was prior to September 11.
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<br>Subjects: Aeronautics; National security</div>
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Oldham, Paul M.</div>
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