Columbia subject headings:
Aeronautics, Military--New York (State)--Safety measures.
Aeronautics, Military--Vermont--Safety measures.
Airplanes--Collision avoidance--New York (State)
Airplanes--Collision avoidance--Vermont.
Airplanes--Recognition--United States.
Harvard subject headings:
Princeton subject headings:
Aeronautics, Military--New York (State)--Safety measures.
Aeronautics, Military--Vermont--Safety measures.
Airplanes--New York (State)--Collision avoidance.
Airplanes--Recognition--United States.
Airplanes--Vermont--Collision avoidance.