article_snippet: The co-pilot blamed for deliberately crashing  a passenger jet with 150 people on board into the Alps used post-9/11 safety mechanisms to carry out co- plan.
article_snippet: Ironically, this auto-lock feature, which led to Lubitz having sole control of the plane, was introduced as a way of improving flight safety in the wake of 9/11.
article_snippet: the Airbus A-320 is fitted with a safety system, pictured, to prevent unauthorised access to the flight deck .
article_snippet: 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: 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: (like the one above) can be disabled from inside the flight deck to prevent hijacking .
article_snippet: Cabin crew can use a code and gain access to the flight deck.
article_snippet: Entry is controlled by Cabin crew, in case of a possible hijack attempt.
article_snippet: 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: Pilots can restrict access to the flight deck although cabin crew can gain entry in an emergency.
highlights_snippet: Since 9/11 all passenger jets are required to lock the cockpit door in flight .
  
highlights_snippet: Cabin crew can gain access using a special code - but pilots can stop this .
  
highlights_snippet: However, the lock is on a timer in case the pilots are incapacitated .
  
highlights_snippet: Locking or unlocking the door latches, upon flight crew action .
  