We now know why Flight 9525 and MH370 crashed, both crashes may have been prevented if the pilots were stood-down for their medical condition or if the doctor had reported them to their employer. The pilot Andreas Lubitz was suffering from depression and been self-centered felt that he would leave his mark before departing from his decision to murder 149 innocent people on-board the A320 airliner, one of the safest planes ever built.

The airlines have now adopted a policy that two pilots must be in the cockpit at all times. What if one pilot disables the other when the third pilot leaves the cabin? What is really needed is for a special key that when a pilot leaves the cabin door he can isolate any-other pilot in the cockpit from blocking his reentry into the cabin when his key is turned and the door code is entered, thus preventing a pilot from inside by locking him outside the door.

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