Another mystery surrounding missing Malaysian Airlines Flight 370, before the plane lost contact with air traffic controllers, is it didn't report any problems. Radar data suggests the plane may have turned back before disappearing, according to Malaysian officials.
This lack of information describing what happened points to what may be a issue with modern airplanes: an outdated communications system. Here in the U.S., an effort to replace it with one based on GPS technology that constantly relays plane information has stalled.
For more we're joined by Joan Lowy transportation reporter for the Associated Press