Grieving families of those killed in Sunday's Ethiopian Airlines crash stormed out of a meeting with the airline, saying they were not being given any information on Thursday.
"I’m so angry," Yemeni citizen Abdulmajid Shariff, who lost his brother-in-law in Sunday's crash told Reuters.
"They called us to give us a report on bodies and the reasons for the crash but there was no information."
Riyadh resident Sultan Al Mutairi, whose brother was among the 157 people killed said: "We did not get any answers [at the meeting]."
An Ethiopian delegation flew the black boxes from the Ethiopian Airlines crash from Addis Ababa to Paris for analysis.
The voice and data recorders from the crashed Boeing 737 Max 8 were taken by Ethiopia's Accident Investigation Bureau to France after Germany declined a request for assistance, saying it wasn’t technically possible.
Late on Wednesday, the ban on the Boeing 737 Max aircraft became worldwide after US President Donald Trump joined Canada and other countries in grounding the aircraft amid mounting global fears for the jets' airworthiness.
US authorities said new evidence showed similarities between Sunday's deadly crash and a fatal accident in Indonesia in October.
The Federal Aviation Administration said findings from the crash site near Addis Ababa and "newly refined satellite data" warranted "further investigation of the possibility of a shared cause for the two incidents."
An FAA emergency order grounded 737 MAX 8 and MAX 9 aircraft until further notice.
Mr Trump said at the White House the "safety of the American people and all peoples is our paramount concern".
Mexico late Wednesday suspended MAX 8 and 9 operations, after Canada and Chile also joined the long list of countries to ban the plane from flying in their airspaces.
Many airlines have voluntarily taken it out of service. Brazil, Costa Rica and Panama followed suit.
"Hopefully they will come up with an answer but until they do the planes are grounded," Mr Trump said.
FAA acting chief Daniel Elwell said the agency has been "working tirelessly" to find the cause of the accident but faced delays because the black box flight data recorders had been damaged.
The new information shows "the track of that airplane was close enough to the track of the Lion Air flight... to warrant the grounding of the airplanes so we could get more information from the black boxes and determine if there's a link between the two, and if there is, find a fix to that link," Mr Elwell said on CNBC.
Boeing chief Dennis Muilenburg said he supported the US decision "out of an abundance of caution" but continued to have "full confidence" in the safety of the plane.
The company continues its efforts "to understand the cause of the accidents in partnership with the investigators, deploy safety enhancements and help ensure this does not happen again," Muilenburg said in a statement.
The accounts of the recent crashes were echoed in concerns registered by US pilots on how the Max 8 behaves.
737 Max pilots concerns
At least four American pilots made reports following the Lion Air crash, all complaining the aircraft suddenly pitched downward shortly after takeoff, according to documents reviewed by AFP on the Aviation Safety Reporting System, a voluntary incident database maintained by Nasa.
In two anonymous reports on flights just after the Lion Air crash, pilots disconnected the autopilot and corrected the plane's trajectory.
One said the flight crew reviewed the incident "at length... but can't think of any reason the aircraft would pitch nose-down so aggressively."
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The world's Boeing 737 Max 8 fleet
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Aerolineas Argentinas has temporarily suspended operations of its five Max 8 aircraft. Reuters -
Aeromexico. The Mexican airline said it suspended the operation of its six MAX 8 planes and those flights would be covered by the rest of its fleet. Marian Lockhart / Boeing -
American carriers such as American Airlines, Southwest Airlines and United are still operating its Max 8 fleets. Reuters -
Brazilian carrier GOL Linhas Aereas has grounded 7 planes Corbis -
Cayman Airways has grounded its two jets. Marian Lockhart / Boeing -
Chinese carriers like China Southern Airlines have grounded their Max 8 aircraft. Reuters -
Chinese carriers like Air China have grounded their Max 8 aircraft. EPA -
Chinese carriers like Hainan Airlines have grounded their Max 8 aircraft. -
Shanghai Airlines have grounded their Max 8 aircraft. AP Photo -
Canadian carriers like Air Canada and WestJet are still flying the Max 8. AP Photo -
Ethiopian Airlines, the carrier at the centre of the Boeing 737 Max 8 crisis, has grounded its fleet. AP Photo -
Fiji Airways are flying their Max 8 aircraft. Courtesy Fiji Airways -
Icelandair has grounded its active fleet. Jim Anderson / Boeing -
Lion Air and fellow Indonesian carrier Garuda Indonedia have their Boeing 737 Max jets grounded. AFP Photo -
Norwegian budget carrier 'Norwegian' has grounded 18 jets. EPA -
A Jet Airways Boeing 737 MAX 8 aircarft. India has closed its airspace affecting Jet and SpiceJet. Reuters. -
India said it will ground MAX aircraft. SpiceJet Ltd has 12 MAX 8s. Craig Larson photo -
Royal Air Maroc has temporarily grounded its 737 Max aircraft. Paul C Gordon / Boeing -
Oman has suspended 737 Max operations in and out of the country. This affects Oman Air which has five aircrafy. Bloomberg -
LOT, the Polish Airlines carrier, has grounded five jets. Alamy -
Singapore's SilkAir has grounded six aircraft. AP Photo -
South Korean airline Eastar Jet has grounded two planes. -
Leisure carrier TUI will ground 16 aircraft. AP Photo -
Turkish Airlines said it had suspended its 12 Boeing 737 MAX aircraft. It operates 11 Max 8 and a Max 9 aircraft. AFP -
Flydubai has grounded 15 planes - 12 Max 8s and 3 Max 9s. Courtesy Anna Zvereva -
Also - Russian S7 Airlines said it would ground its two MAX 8 planes starting Wednesday and that the decision would not affect its flight schedules. South African British Airways's Comair has grounded its Max 8 plane and Canadian holiday carrier Sunwing is suspending its four jets.
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It was unclear if US transportation authorities review the database or investigate the incidents. However, the FAA said this week it had mandated that Boeing update its flight software and training on the aircraft.
Questions about the Lion Air crash have honed in on an automated stall prevention system, the MCAS, designed to automatically point the nose of the plane downward if it is in danger of stalling.
According to the flight data recorder, the pilots of Lion Air Flight 610 struggled to control the aircraft as the MCAS repeatedly pushed the plane's nose down following takeoff.
The Ethiopian Airlines pilots reported similar difficulties before their aircraft plunged into the ground as they tried to return to the airport.
Boeing was criticised after the Lion Air crash for allegedly failing to adequately inform 737 pilots about the functioning of the stall prevention system.
Ethiopian Airlines CEO Tewolde GebreMariam on Sunday said the captain on the flight, Yared Mulugeta Getachew, 29, was an experienced aviator with more than 8,000 flight hours.
Andrew Hunter, a defence industry expert at the Center for Strategic and International Studies in Washington, said that, while Boeing and the FAA had good track records on addressing safety concerns, sometimes the combination of automated systems and humans did not work smoothly.
"It is hard to get a system to work seamlessly with human beings," he told AFP.
"The fact the system was fighting the pilot was not an unintended consequence," because it should counteract a pilot error and correcting this is "challenging."
In Ethiopia, distraught families wept and lit candles as they visited the deep black crater where the plane smashed into a field, killing 157 passengers and crew.
The Ethiopian Airlines 737 Max 8 was less than four months old when it went down six minutes into a flight from Addis Ababa to Nairobi on Sunday, disintegrating on impact.
Families of the victims from Kenya, China, the United States and Canada, as well as diplomatic staff from embassies, were visiting the crash site.
A dozen airlines have grounded the plane, while Nigeria, Lebanon, Egypt, Serbia, Vietnam, New Zealand and Hong Kong on Wednesday also joined the list of countries to ban it from their airspace.
The European Union and major hubs such as the UAE and Australia had already done so.
American Airlines said it had 24 aircraft affected by the US ban, while Southwest Airlines said it was still confirming the move.
The Max series is Boeing's fastest-selling model.
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Business Extra: What the tragedy means for confidence in Boeing's 737 Max 8
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There are 74 of the planes registered in the United States, and 387 in use worldwide with 59 carriers, according to the FAA.
Low-cost airline Norwegian Air Shuttle has said it would demand financial compensation from Boeing as the implications of the mass grounding for the airline industry remained unclear.
Shares in the company rose Wednesday on Wall Street despite the US order but were still down 10.6 per cent since before Sunday's crash.
