Columbia subject headings:
Aeronautics--Safety measures.
Airplanes--Piloting--Safety measures.
Laser beams--Safety measures.
Terrorism--United States--Prevention.
Harvard subject headings:
Aeronautics--Safety measures
Airplanes--Piloting--Safety measures.
Laser beams--Safety measures.
Terrorism--United States--Prevention
Princeton subject headings:
Aeronautics--Safety measures.
Airplanes--Piloting--Safety measures.
Laser beams--Safety measures.
Terrorism--United States--Prevention.