article_snippet.sent: Ironically, this auto-lock feature, which led to Andreas Lubitz having sole control of the plane, was introduced as a way of improving flight safety in the wake of 9/11.
article_snippet.sent: The Airbus A-320 is fitted with a safety system, pictured, to prevent unauthorised access to the flight deck .
article_snippet.sent: the Airbus A320 is fitted with a locking mechanism to prevent unauthorised access to the flight deck while the aircraft is in flight. 
article_snippet.sent: The safety systems were improved in the aftermath of the 9/11 terror attacks where hijackers were able to gain access to the cockpit and take over the aircraft.
article_snippet.sent: (like the one above) can be disabled from inside the flight deck to prevent hijacking .
article_snippet.sent: Cabin crew can use a code and gain access to the flight deck.
article_snippet.sent: Entry is controlled by Cabin crew, in case of a possible hijack attempt.
article_snippet.sent: both pilots also have a CCTV camera so both pilots can see who is seeking access, and if both pilots are under any form of duress.
article_snippet.sent: Pilots can restrict access to the flight deck although cabin crew can gain entry in an emergency.