. >> this flight was at the outer reachers of the effectiveness of the radar tracking it. the further you are away from the radar station, the less accurate it is. they are determining that perhaps it could have changed course. they are - it's a very challenging issue. one thing that is critical is that the black boxes, the flight data recorder and the cockpit voice recorder - they issue out, you know, they transmit a ping. an identifying tone that leads searches to them. if you can't get within a few miles of where they are located, you can't hear them. it will raise an issue about do we need to rethink the issue of how we track the aircraft, and maybe we should consider things like deployable black boxes, which would eject from the plane upon impact, and float. >> thank you to peter gole, is there. >> still ahead - former federal bureau of investigation agent and c.i.a. contractor robert levinson went missing in iran seven years ago today. we hear from his wife offer the break. the head of a war in syria is on the brink of becoming a failed nation. those stories and more