WASHINGTON (AP) — French prosecutors' assertion that this week's air crash of a German airliner into a rugged mountainside was a deliberate act of the co-pilot points to the possible need for a third pilot in airline cockpits, several aviation safety experts said Thursday. "The flight deck is capable of accommodating three pilots and there shouldn't ever be a situation where there is only one person in the cockpit," said James Hall, a former chairman of the National Transportation Safety Board, referring to the "jump seats" in airliners. Prosecutors said the co-pilot of the Germanwings Flight 9525 had apparently locked himself in the cockpit before the plane crashed into a mountainside in the Alps.Read more on NewsOK.com