[Jamesy]

I thought a more efficient way would be to have a hidden keypad near the door that allows air cabin crew to unlock the door electronically.

Although whatever fail safe is created, it will be broken one way or another eventually. The whole three people in the cabin thing isn't guaranteed to work either, or having one staff go in if a pilot leaves. The other staff can easily be knocked out or killed by the pilot aiming to kill.

The main thing to ponder over now is why did the co-pilot crash the plane? That will be the interesting thing. It might not be terrorist related. He might have been going through something personal at home, or have some physiological issues that people didn't know of. I assume that's where the investigation team are going to look at next.

At least in a way those families who have lost ones can know for a fact what happened. This has all been announced quite quickly which is rare when it comes to plane crashes.