This is absolutely shocking if true that this was an intentional act by a crew member. The security put in place created an awful event which itself was an act of terror (ism)
Someone suggested a changeable code which both crew members select for the day and which overrides any locking action from within but surely any person of the mindset to take himself out and 150 innocent people wouldn't think twice about killing the other crew member to get control of the aircraft!
Since 9/11 all focus has been on aircraft and a multi billion security industry has grown around aviation when there are other modes of transport where equal passenger numbers are carried with zero security
Where do we stop?
The next thing will be retina detection systems to identify crew members of an airline and only allow them access