article_snippet: co-pilot Andreas Lubitz's breathing can still be heard on the voice recorder, according to " Bild's report.
article_snippet: Cockpit recordings are some of the most sensitive and closely held parts of aviation crash investigations.
article_snippet: Cockpit recordings're never officially released, according to CNN aviation reporter Richard Quest.
article_snippet: CNN aviation reporter Richard Quest called it "unbelievable" that the black box audio would be leaked in this manner.
article_snippet: Communications between air traffic control and a plane's cockpit can be downloaded privately, but that's less common in Europe than it is in the United States.
article_snippet: Although search teams have recovered the cockpit voice recorder, the flight data recorder remains missing.
article_snippet: That device could reveal crucial details about what happened during the final moments of the flight.