Investigators in France have taken charge of the crashed Ethiopian Airlines aircraft's black boxes as they attempt to uncover what caused the Boeing 737 Max disaster.
The Bureau of Enquiry and Analysis for Civil Aviation Safety received the flight data and cockpit voice recorders on Thursday.
The first readings could take days, but a lot depends on the boxes' condition.
It comes as regulators across the world continue to ground the Boeing aircraft.
Jamaica has restricted the jet from its airspace.
Other countries have taken similar action.
Sunday's Ethiopian Airlines crash, shortly after take-off from Addis Ababa, killed 157 people from 35 nations.
It was the second crash involving a 737 Max in six months and some people have pointed to similarities between the incidents.
Experts have cited satellite data and evidence from the crash scene as showing links between Sunday's disaster and October's crash in Indonesia of Lion Air jet that killed 189 people.