article_snippet: CNN aviation analyst Mary Schiavo said a plane's speed is one clue.
article_snippet: This could indicate that there was not a stall, but that the pilot was still controlling a plane to some extent, CNN aviation analyst Mary Schiavo said.
article_snippet: Had there been an engine stall, a plane would have crashed in a matter of minutes, CNN aviation analyst Mary Schiavo said.
article_snippet: That small piece of information about the descent means that the pilot could have been trying to make an emergency landing, or that a plane was gliding with the pilot's guidance, CNN aviation analyst Mary Schiavo said.