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Holiday travelers line up for one of the TSA security checkpoints at Ronald Reagan National Airport (DCA) in Washington on November 26, 2013 as air traffic increases for  the Thanksgiving holiday.    AFP PHOTO/Paul J. Richards        (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
Holiday travelers line up for one of the TSA security checkpoints at Ronald Reagan National Airport (DCA) in Washington on November 26, 2013 as air traffic increases for  the Thanksgiving holiday.    AFP PHOTO/Paul J. Richards        (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

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    U.S. cities amping up security before holiday

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U.S. cities amping up security before holiday

U.S. cities are preparing for the worst case scenario before Thanksgiving by conducting shooting drills and testing communications.

U.S. cities amping up security before holiday

U.S. cities are preparing for the worst case scenario before Thanksgiving by conducting shooting drills and testing communications.