The co-pilot of flight 4U9525 allegedly failed to inform airline Germanwings that he was sick. He's being blamed for the death of 150 people. DW interviewed psychologist Rudolf Egg about possible motives.
Questions are being asked about the mental health of a co-pilot thought to have deliberately crashed a Germanwings plane. But pilot aptitude tests are designed to weed out such cases, expert Michael Müller tells DW.
Modern cockpit doors have safety systems to keep out intruders. They can be opened from the cabin - to help pilots in an emergency. But control is from within. And that has its own dangers.
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