09/02/2026
Reinforced flight deck doors transformed aviation security after 9/11. But whenever the door opens in flight, a vulnerability remains.
Secondary flight deck barriers help close that gap, providing an additional layer of protection and giving pilots critical time to secure the flight deck during a potential threat.
For 25 years, ALPA has advocated for secondary barriers because aviation security is strongest when every layer of defense is in place. While secondary barriers are now required on newly manufactured passenger aircraft, thousands of aircraft already in service still operate without them.
Protecting every flight deck means protecting pilots, passengers, crew, and communities on the ground.