article_snippet: We don't know yet the reason why one of the guys went out," " a senior military official involved in the investigation said, according to a New York Times report.
article_snippet: But CNN aviation analyst Peter Goelz and other experts cautioned that it's still unclear what could have been going on inside the cockpit.
article_snippet: Possibilities range from a medical emergency to something more nefarious, like a suicide mission, CNN aviation analysts said.
article_snippet: It is too early to draw conclusions to what happened," said Remi Jouty, head of the BEA, the French aviation investigative arm leading the probe.
article_snippet: Finding the plane's second black box will also be critical to understanding the mystery of what went on inside the jet.
article_snippet: the plane's second black box, the flight data recorder, hasn't been found yet, but Lufthansa CEO Carsten Spohr said Wednesday that there's a high probability it will be.
article_snippet: Officials are struggling to understand how an airplane that "was in perfect technical condition" with two experienced pilots "was involved in such a terrible accident," Lufthansa CEO Carsten Spohr said.
article_snippet: We need to understand what happened," French President Francois Hollande said.
article_snippet: Investigators are still trying to piece together what caused the crash.
article_snippet: Jouty, the head of the investigation team, said the debris suggests the plane hit the ground and then broke apart, instead of exploding in flight.
article_snippet: Radar followed the plane "virtually to the point of impact" in the French Alps in southern France, Jouty said.
highlights_snippet: Teams are still searching for the flight data recorder .