Aeronautics, Commercial -- Security measures 6 Terrorism -- 4 Prevention 3 Evaluation. -- 2 Government policy -- 2 Hijacking of aircraft 2 more ... Hijacking of aircraft -- 2 Law and legislation 2 Political aspects 2 Prevention. -- 2 Terrorism 2 War on Terrorism, 2001-2009 2 Aeronautics -- 1 Airlines -- 1 Airports -- 1 Congresses 1 International cooperation 1 Law and legislation -- 1 Passenger traffic 1 Security measures -- 1 Surface-to-air missiles 1 less ...