U.S. safety officials review Ethiopian black box data: sources

The National Transportation Safety Board has reviewed raw data from the flight data recorder and listened to the cockpit voice recorder, the sources said.Under international rules, Ethiopia safety officials are in charge of the investigation and are the only entity that can release information about the probe.Boeing unveiled new software upgrades and training on Wednesday after two fatal crashes of Boeing 737 MAX 8 airplanes in five months led regulators around the world to ground the planes, in