The investigation may focus on an automated anti-stall system that dips the aircraft's nose down. "As you might be aware of, the captain made a distress call asking clearance to get back to Addis Ababa's airport, but while he was attempting to return back, the accident occurred", said Kaleyesus Bekele, an aviation expert.
As noted earlier, dozens of countries, including Britain, France, Germany, India, Belgium and Ireland, announced Tuesday that they will ban the Boeing 737 MAX 8 aircrafts from entering their air-space.
Another almost 5,000 MAXs are on order, meaning the financial implications are huge for the industry.
The three U.S. airlines using the 737 MAX - Southwest Airlines Co, American Airlines Group Inc and United Airlines - stood by the aircraft, although many potential passengers took to social media to express concerns, asking if they could change flights or cancel.
Passengers were fretting too, with many seeking reassurances they would not be flying on a 737 Max. Many said the plane would suddenly dive nose-first. Its stock has fallen about 11 percent since the crash, wiping almost $26 billion off its market value.
John Quindos Karanja lost his wife, his daughter, and three grandchildren in the plane crash. We never interacted again.
Papal advisor George Pell sentenced to 6 years in prison
Under the terms of the sentencing, Pell must serve a minimum of 3 years and 8 months before he is eligible for parole. Pell went on trial for the offences in December a year ago and a jury returned unanimous guilty verdicts.
Antonis Mavropoulos and Ahmed Khalid were both scheduled to board the Boeing plane to Nairobi but missed their flight for different reasons. The staff members were flanked by bouquets of white roses and white candles.
Only charred fragments of victims remain, meaning it will take weeks to identify all of them using dental or DNA testing.
At the time, Mavropoulos was traveling to Nairobi for an environmental conference and arrived in Addis Adaba, the capital of Ethiopia, with less than 30 minutes to make his connecting flight. Egypt, Thailand, Lebanon, Serbia, Kosovo and Uzbekistan joined them on Wednesday.
"At this point, based on the information available, we do not have any basis to issue new guidance to operators", Charlie Miller, Boeing's vice president of communications, said in a statement.
In the US, American Airlines and Southwest Airlines operate the Max 8 and United Airlines flies a slightly larger version, the Max 9.
The 737 line, which has flown for more than 50 years, is the world's best selling modern passenger aircraft.
Following the Lion Air crash, it took four days from the discovery of the flight data recorder for Indonesia's National Transportation Safety Committee to reveal that the plane had a malfunctioning air speed indicator for its last four flights, and at the time of the crash.