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Caption:FRANKFURT, GERMANY - MARCH 14:(EXCLUSIVE COVERAGE)(EDITOR'S NOTE: This photo is available exclusively through Getty Images except in Germany) In this photo released today, co-pilot of Germanwings flight 4U9525 Andreas Lubitz participates in the Frankfurt City Half-Marathon on March 14, 2010 in Frankfurt, Germany. Lubitz is suspected of having deliberately piloted Germanwings flight 4U 9525 into a mountain in southern France on March 24, 2015 and killing all 150 people on board, including himself, in the worst air disaster in Europe in recent history. (Photo by Getty Images)
Caption:FRANKFURT, GERMANY - MARCH 14:(EXCLUSIVE COVERAGE)(EDITOR'S NOTE: This photo is available exclusively through Getty Images except in Germany) In this photo released today, co-pilot of Germanwings flight 4U9525 Andreas Lubitz participates in the Frankfurt City Half-Marathon on March 14, 2010 in Frankfurt, Germany. Lubitz is suspected of having deliberately piloted Germanwings flight 4U 9525 into a mountain in southern France on March 24, 2015 and killing all 150 people on board, including himself, in the worst air disaster in Europe in recent history. (Photo by Getty Images)

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Prosecutor: Germanwings co-pilot feared going blind

A French prosecutor has opened an inquiry into why Germanwings co-pilot Andreas Lubitz was still allowed to fly. CNN's Richard Quest explains.

Prosecutor: Germanwings co-pilot feared going blind

A French prosecutor has opened an inquiry into why Germanwings co-pilot Andreas Lubitz was still allowed to fly. CNN's Richard Quest explains.