Malaysia Airlines flight MH370 'on move for hours'
19 March 2014 Last updated at 22:56 GMT
Transmissions detected at hourly intervals suggest Malaysia Airlines flight MH370 was moving for several hours after communications with the craft were lost, the BBC has learned.
But could the data reveal the location of the plane which went missing on 8 March with 239 people on board?
The BBC's Andy Moore has this analysis.