Prohibited from talking to the families under annex 13 of the iko, international civil aviation organization. >> reporter: a lawsuit could force the manufacturer to turn over information about its aircraft. with the plane still missing, some say the families don't have a case at least against the boeing company. >> you're not going to be able to bring a claim against boeing without the wreckage or the black box. just not possible. >> reporter: these aviation attorneys are clearly not optimistic that the families will get the answers they're looking for, at least not today. the shareholder's me...