The World War II mystery of what happened to a Finnish passenger plane after it was shot down over the Baltic Sea by Soviet bombers appears to finally be solved more than eight decades later. The plane was carrying American and French diplomatic couriers in June 1940 when it was shot down just days before Moscow annexed the Baltic states. All nine people on board the plane were killed including the two-member Finnish crew and the seven passengers including an American diplomat. A diving and salvage team in Estonia said this week that it had located well-preserved parts and debris from the Junkers Ju 52 plane operated by Finnish airline Aero which is now Finnair.