Which security practice saw an increase as a result of 9/11?

• A. Increased screening
• B. Longer boarding queues
• C. Fewer security checks
• D. Reduced passenger screening

Answer: (A)

After the 9/11 attacks, aviation security shifted to a tougher, layered approach that prioritizes thorough screening of both people and their belongings. This led to the creation of centralized security oversight, new procedures, and widespread use of screening technologies, making passenger and baggage screening much more extensive in everyday travel. The result is that security practice increased overall, reflecting a commitment to detect and deter threats more effectively.

Longer boarding queues are not a security practice in themselves, and reducing or eliminating screening would run contrary to the observed changes. So the standout improvement tied to 9/11 is the rise in comprehensive screening.