Which of the following is a primary in-flight security measure?

• A. Secondary flight deck protection
• B. Flight crew trained in self-defense
• C. Federal Flight Deck Officer Program
• D. Passenger intervention

Answer: (B)

This question is about actions that can be taken immediately on board to handle a threat. A primary in-flight security measure is something the crew can deploy right away to directly control a situation and protect people and the aircraft.

Training the flight crew in self-defense provides the crew with hands-on skills they can use during an incident, without waiting for outside resources. It enables a rapid, direct response to a threat, which is exactly what a primary measure aims to achieve.

Secondary flight deck protection focuses on preventing access to the cockpit through barriers and procedures. While important, it is a preventive control that operates before or outside of active incident response, not the immediate action taken during a threat.

The Federal Flight Deck Officer Program involves arming specific pilots and is not universally implemented or applicable on every flight; it reflects a policy option rather than a standard, on-the-spot response available to all crews.

Passenger intervention refers to passengers getting involved, which is unpredictable and not a formal, trained response; it is supplementary rather than a primary, crew-led action.

So the most direct, real-time capability for handling a threat from the moment it arises is the flight crew being trained in self-defense.