Killer in the Cockpit?

Compared to the number of suicides in the general population, suicidal pilots are almost statistically non-existent. But when they do emerge from obscurity to unleash their horrific plans on innocent passengers, the destruction they inflict is epic. A 737 cruising above an Indonesian jungle suddenly plummets from the sky. An Airbus A-320 crashes into the French Alps. And, Malaysian Airlines Flight 370 vanishes over the South China Sea, and remains one of the greatest aviation mysteries of all time.