When the Federal Aviation Wardship spoken it was grounding all Boeing 737 Max planes, the organ said it had identified similarities between last week’s Ethiopian Airlines crash and the Lion Air crash in Indonesia six months earlier.

The Ethiopian Minister of Transport reiterated that point on Sunday, by  saying preliminary data recovered from the woebegone boxes of the crash in Ethiopia showed similarities to the Air Lion crash.

Neither organ provided many specifics.

So how were the two crashes similar?

This is what happened with each flight

Ethiopian Airlines Flight 302 crashed the morning of March 10 without taking off from Addis Ababa on its way to Nairobi, Kenya, killing all 157 people on board. The plane was delivering passengers from virtually the world, many of whom worked for the United Nations.

Lion Air Flight 610 crashed into the Java Sea in Indonesia on October 29 without taking off from Jakarta. All 189 people on workbench died. The plane was scheduled to make a one-hour journey to Pangkal Pinang on the island of Bangka.

Both were Boeing 737 Max 8 planes

The Boeing 737 Max 8 was a new model unveiled to unconfined fanfare by the US aviation giant well-nigh two years ago. The airline moreover produced a Max 9 and has plans to offer a Max 7 and Max 10, with model numbers based on seating capacity.

There are approximately 350 Boeing 737 Max 8 watercraft in operation worldwide, belonging to 54 operators, equal to the FAA.

Boeing’s website says the 737 Max is the fastest-selling plane in the company’s history, with well-nigh 5,000 orders from increasingly than 100 customers worldwide.

President Donald Trump said on March 13 his wardship was ordering the grounding of all Max 8 and 9 models, hours without Canada said it was grounding the planes without analyzing new satellite tracking data.

Both planes used the same software

The planes were equipped with streamlined flight software tabbed the Maneuvering Characteristics Augmentation System (MCAS), a relatively new full-length to Boeing’s Max planes.

The MCAS is a system that automatically lowers the nose of the plane when it receives information from its external wile of wade (AOA) sensors that the watercraft is flying too slowly or steeply, and at risk of stalling.

The AOA sensors send information to the plane’s computers well-nigh the wile of the plane’s nose relative to the airflow over and under the wings to help determine whether the plane is well-nigh to stall.

Jean-Paul Troadec, the former throne of France’s aviation wrecking investigation bureau, told CNN that he saw flaws in the system.

“I think the diamond of this system is not satisfactory as it relies on only one sensor,” he said. “In specimen this sensor fails, of undertow the system doesn’t work. And in this specimen it could be difficult for the pilot to overreact to the system.”

Boeing CEO Dennis Muilenburg said Monday a software update and related pilot training for the 737 MAX will be released “soon” and will write concerns discovered in the produce of the Lion Air crash.

Both planes crashed shortly without takeoff

The Ethiopian Airlines flight went lanugo six minutes without takeoff.

The Air Lion plane crashed 13 minutes without taking off.

Both planes had experienced crews

Ethiopian Airlines tweeted that the first officer had 350 hours of flying time and the pilot in writ had 8,100 hours.

The tutorage of the Lion Air flight, Bhavye Suneja, an Indian national, had increasingly than 6,000 flight hours, and his copilot, named Harvino, had logged increasingly than 5,000, equal to a statement posted by Lion Air.

The International Civil Aviation Organization, an organ of the United Nations, recommends commercial pilots have a minimum of 150 hours. The FAA requires that commercial pilots have 1,500 hours.

Both pilots reported problems

The Ethiopian Airlines pilot said he was having difficulties and asked to return to base, Ethiopian Airlines CEO Tewolde GebreMariam told CNN. The pilot was granted permission to return to ground virtually the same time the flight disappeared from radar.

A preliminary report by Indonesia’s National Transportation Safety Committee said the hairdo of Air Lion Flight 610 struggled to override the plane’s will-less systems in the minutes surpassing it plunged into the ocean. The system pulled the plane’s nose lanugo increasingly than two dozen times, the report said.

The report said the MCAS system was responding to incorrect data transmitted by an AOA sensor. A variegated flight hairdo experienced the same issue on a flight from Denpasar to Jakarta the previous day, but had turned off the MCAS and took transmission tenancy of the plane, the report said.

The Ethiopian Wrecking Investigation Organ intends to release a preliminary report within 30 days.