WASHINGTON/PARIS/ADDIS ABABA (Reuters) – France’s air safety agency on Friday began studying data from the black boxes of a Boeing 737 MAX plane that crashed in Ethiopia, as regulators the world over grounded the plane and the U.S. planemaker halted deliveries of its latest model.

The Ethiopian Airlines jet crashed soon after takeoff from Addis Ababa on Sunday, killing 157 people. It was the second crash involving a 737 MAX since October, when a Lion Air flight plunged into the sea off Indonesia with 189 people on board.

Investigators will be looking for any links between the two air disasters.

The U.S. Federal Aviation Administration (FAA) grounded all Boeing MAX jets in service because of similarities.

Boeing said it had paused deliveries of its fastest-selling 737 MAX aircraft built at its factory near Seattle, but continues to produce the single-aisle version of the jet at full speed while dealing with the worldwide fleet’s grounding.

Possible links between the accidents have rocked the aviation industry, scared passengers, and left the world’s biggest planemaker scrambling to prove the safety of a money-spinning model intended to be the standard for decades.

The flight data and cockpit voice recorders were handed over to France’s Bureau of Enquiry and Analysis for Civil Aviation Safety (BEA) on Thursday. The first conclusions could take several days.

(graphic: tmsnrt.rs/2ChBW5M)

A picture of the data recorder released by the agency showed the crash-proof housing that shields the critical recording chip apparently intact, though there was damage to the side of the box. Investigators will also analyze the voice recorder, which should have picked up conversations between the pilots as well as with air traffic controllers.

An Ethiopian team investigating the crash has arrived in Paris and the investigation process has started, Ethiopian Airlines said on Friday.

U.S. lawmakers said on Thursday the 737 Max fleet would be grounded for weeks if not longer until a software upgrade could be tested and installed.

Boeing has said it would roll out the software improvement “across the 737 MAX fleet in the coming weeks.”

The captain of Ethiopian Airlines Flight 302 requested permission to return to Addis Ababa airport three minutes after takeoff as it accelerated to abnormal speed, the New York Times reported.

All contact between air controllers and Flight 302 to Nairobi was lost five minutes after it took off, a person who reviewed air traffic communications told the newspaper.

Within a minute of the flight’s departure, Captain Yared Getachew reported a “flight control” problem as the aircraft was well below the minimum safe height during a climb, the newspaper reported, citing the source.

After being cleared by the control room to turn back, Flight 302 climbed to an unusually high altitude and disappeared from radar over a restricted military zone, the source added.

Relatives of the dead stormed out of a meeting with Ethiopian Airlines on Thursday, decrying a lack of transparency, while others made the painful trip to the crash scene.

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“I can’t find you! Where are you?” said one Ethiopian woman, draped in traditional white mourning shawl, as she held a framed portrait of her brother in the charred and debris-strewn field.

Nations around the world, including an initially reluctant United States, have suspended the 371 MAX models in operation, though airlines are largely coping by switching flights to other planes in their fleets.

Nearly 5,000 MAXs are on order, meaning the financial implications are huge for the industry.

“We continue to build 737 MAX airplanes while assessing how the situation, including potential capacity constraints, will impact our production system,” Boeing spokesman Chaz Bickers said.

Boeing would maintain its production rate of 52 aircraft per month, of which the MAX, its newest version, represents the major share. However, Boeing declined to break out exact numbers.

CONNECTION TO INDONESIA CRASH?

The FAA cited satellite data and evidence from the scene that indicated some similarities and “the possibility of a shared cause” with October’s crash in Indonesia.

Two sources familiar with the matter said crash site investigators found a piece of a stabilizer used to set the airplane’s trim that was in an unusual position similar to that of the Lion Air plane at the time of its crash.

FAA did not respond immediately to a request for comment outside normal office hours. Boeing declined to comment.

The head of Indonesia’s transport safety committee said the report into the Lion Air crash would be speeded up so it could be released in July to August, months earlier than originally expected.

Though it maintains the planes are safe, Boeing has supported the FAA move. Its stock is down about 11 percent since the crash, wiping more than $26 billion off its market value. It fell 1 percent on Thursday.

U.S. and Canadian carriers wrestled with customer calls and flight cancellations and Southwest Airlines Co and American Airlines Group Inc, the largest U.S. operators of the 737 MAX, said they had started flying empty MAX aircraft to be parked elsewhere during the ban.

U.S. President Donald Trump, an aviation enthusiast with deep ties to Boeing, said he hoped the suspensions would be short. “They have to figure it out fast,” Trump told reporters at the White House.

A software fix for the 737 MAX that Boeing has been working on since the Lion Air crash in October will take months to complete, the FAA said on Wednesday.

In what may presage a raft of claims, Norwegian Air has said it will seek compensation from Boeing for costs and lost revenue after grounding its fleet of 737 MAX.

Airline Garuda Indonesia said there was a possibility it would cancel its order for 20 Boeing 737 MAXs, while Malaysia Airlines said it was reviewing an order for 25 of the aircraft.

Under international rules, Ethiopians are leading the investigation but France’s BEA will conduct black box analysis as an adviser. The U.S. National Transportation Safety Board (NTSB) was also sending three investigators to assist.

The cause of the Indonesian crash is still being investigated. A November preliminary report, before the retrieval of the cockpit voice recorder, focused on maintenance and training and the response of a Boeing anti-stall system to a recently replaced sensor, but gave no reason for the crash.

(Corrects para 8 to make clear description is of the flight data recorder only.)

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