Columbia subject headings:
Aeronautics, Commercial--Security measures--United States--Evaluation.
Airline passenger security screening--United States--Evaluation.
Airlines--Security measures--United States--Evaluation.
Terrorism--United States--Prevention.
United States. Transportation Security Administration.
Harvard subject headings:
Aeronautics, Commercial--Security measures--United States--Evaluation.
Airline passenger security screening--United States--Evaluation.
Airlines--Security measures--United States--Evaluation.
Terrorism--United States--Prevention
United States. Transportation Security Administration.
Princeton subject headings:
Aeronautics, Commercial--Security measures--United States--Evaluation.
Airline passenger security screening--United States--Evaluation.
Airlines--Security measures--United States--Evaluation.
Terrorism--United States--Prevention.
United States. Transportation Security Administration