article_snippet: (CNN)Germanwings co-pilot Andreas Lubitz was hiding an illness from CNN)Germanwings co-pilot Andreas Lubitz employers and had been declared "unfit to work" by a doctor, according to German authorities investigating what could have prompted the seemingly competent and stable pilot to steer CNN)Germanwings co-pilot Andreas Lubitz jetliner into a French mountain.
article_snippet: According to authorities in Germany and France, Lubitz was a co-pilot on Germanwings Flight 9525 between Barcelona, Spain, and Dusseldorf on Tuesday when Lubitz apparently locked the captain out of the cockpit, then activated a control causing the plane to descend toward rugged terrain.
article_snippet: The only sounds, authorities said, were those of pounding on the cockpit door, Lubitz's steady breathing and, eventually, screaming passengers.
article_snippet: Lubitz and 149 other people on board the plane died in an instant, authorities say.
article_snippet: What could have prompted Lubitz to deliberately destroy the aircraft, killing everyone on board, remained the focus of investigators in Germany.
article_snippet: Lubitz had passed medical and psychological testing when Lubitz was hired in 2013, said Carsten Spohr, CEO of Lufthansa, which owns Germanwings.
article_snippet: Lufthansa officials and German prosecutors declined to comment on the Bild story, Reuters said.
article_snippet: Who was co-pilot Andreas Lubitz?