Lufthansa now says that co-pilot Andreas Lubitz, who crashed a plane in the French Alps last week – killing 150 people – told its flight training school in 2009 that he had gone through a period of severe depression.<br /><br /> The airline previously said it knew of no reason why the Germanwings co-pilot might deliberately crash a plane.<br /><br /> The revelation follows confirmation that Lubitz had suicidal tendencies years before obtaining his pilot’s licence.<br /><br /> Lufthansa, the parent company of Germanwings, had acknowledged that he had interrupted his pilot’s training but had given no further details.<br /><br /> It now says that when he resumed training, he provided the flight school with medical documents showing that he had gone through a “previous episode of severe depression”. <br /><br /> Lufthansa cited e-mailed correspondence between Lubitz and the flight school.<br /><br /> The airline said it had passed the e-mails and additional documents to Duesseldorf prosecutors after internal investigations. <br /><br /> Investigators in Dues