Which measure is a primary in-flight security measure?

• A. Hardened flight deck doors
• B. Secondary flight deck protection
• C. Federal Flight Deck Officer Program
• D. Airport perimeter fencing

Answer: (A)

In-flight security relies on a layered approach, with the cockpit door serving as the primary barrier protecting the flight crew during the flight. Hardened flight deck doors are designed to resist forced entry, with strong locking, blast/impact resistance, and tamper alarms, making them the first line of defense against intruders entering the cockpit. While secondary flight deck protection adds additional safeguards to support the door and crew, it does not serve as the initial barrier. The Federal Flight Deck Officer Program focuses on training and arming pilots rather than providing the primary physical defense. Airport perimeter fencing is an airport-ground security measure, not an in-flight measure.