Ever since the Sept. 11 attacks, airports have probably been the most heavily guarded sites when it comes to preventing terrorist attacks.And yet the most recent terrorism plot in Yemen involved an attempt to blow up a U.S. airliner with a bomber wearing a difficult-to-detect explosive bomb in his underwear, according to U.S. officials.
Why do terrorist groups keep trying to defeat the multiple layers of security at airports when there are so many soft targets?
