Some deterrence elements being used are

• A. Aircraft search; positive passenger bag match; Flight deck access procedures; Vigilance on behalf of flight and cabin crew
• B. Flight attendant training on deterring a threat
• C. Positive passenger bag match
• D. Flight deck access procedures

Answer: (A)

Deterrence in aviation security relies on a layered approach that combines physical screening, verifications, access control, and vigilant monitoring. Aircraft searches screen for prohibited items before they can be used. Positive passenger bag match links a bag to its owner, reducing opportunities for concealment or misuse. Flight deck access procedures restrict and verify who can reach the cockpit, adding a strong barrier against unauthorized entry. Vigilance by flight and cabin crew keeps eyes open for suspicious behavior and reinforces all other controls through ongoing observation and reporting. When these elements work together, they create a comprehensive deterring effect that a single measure on its own cannot achieve.