article_snippet: It will be months, or longer, before the causes behind Tuesday's crash of Germanwings Flight 4U 9525 are known, but there are initial clues that aviation experts say will be the most important to investigators.
article_snippet: One of the Germanwings plane's "black boxes" has been recovered, the French interior minister said.
article_snippet: The data recorder will be the most useful in determining the cause of the crash of the Germanwings plane.
article_snippet: The data recorder contents are still unknown, but Its contents is a good sign that The data recorder was found just hours after the crash of the Germanwings plane.
article_snippet: France's aviation accident investigation bureau will examine the device immediately, the French interior minister said.
highlights_snippet: The cause behind the crash of the Germanwings plane is unknown .
  