Columbia subject headings:
Harvard subject headings:
Aeronautics, Commercial--Security measures--United States
Airline passenger security screening--United States.
Airports--Baggage handling--United States.
Airports--Security measures--United States
Airports--United States--Employees--Selection and appointment.
Princeton subject headings:
Aeronautics, Commercial--Security measures--United States.
Airline passenger security screening--United States.
Airports--Baggage handling--United States.
Airports--Employees--Selection and appointment--United States.
Airports--Security measures--United States.