"In these two crashes it became apparent that Boeing wasn't telling them everything that the FAA needed to know... and the FAA did not proactively go and ask questions".
Global regulators from China to the USA have grounded the best-selling Boeing plane after a 737 Max jet flown by Ethiopian Airlines Group crashed minutes after take off, five months after a Lion Air jet of the same type plunged off the coast of Indonesia.
Tewolde GebreMariam, head of Ethiopian Airlines, told the CNN: "According to the air traffic controller's recorded voice exchange, the pilot recorded flight control problems, so he was having difficulties with the flight control of the aeroplane".
Arthur Wolk, an attorney who represents plaintiffs in air crash litigation and said he has been contacted by a potential plaintiff over the Ethiopian Airlines crash, said Boeing would likely face claims for strict liability.
According to flight tracking website, FlightRadar24, all Boeing 737 MAX jets have now been grounded.More news: FIRST ALERT WEATHER DAY: Severe storms possible this afternoon & evening
American Airlines Group Inc, with 24 MAX 8s, planned to cancel around 85 flights per day as a result of the ban, while servicing some of those flights with other aircraft such as the 737-800.
Canada and the United States announced on Wednesday they would ground the MAX planes, citing new satellite data and evidence from the scene of an Ethiopian Airlines plane crash on Sunday that killed 157 people.
The US National Transportation Safety Board (NTSB) is also sending three investigators to assist.
The causes are still unknown, but both involved a relatively new 737 MAX 8 aircraft that crashed within minutes of takeoff and experienced sudden drops in altitude when the aircrafts should have been steadily climbing.
In two anonymous reports on flights just after the Lion Air disaster, pilots disconnected the autopilot and corrected the plane's trajectory.More news: YouTube star Lilly Singh takes Carson Daly's late night spot
It was unclear if USA transport authorities review the database or investigate the incidents. Japan became the latest nation to suspend the planes on Thursday, and Garuda Indonesia said it may cancel its order for 20 of the aircraft, depending the FAA's position.
Speaking in a "panicky voice", the doomed aircraft's captain requested permission to return to the airport nearly immediately after takeoff as the plane "accelerated to abnormal speed", the newspaper reported Thursday, citing a person who had reviewed the air traffic communications.
Both planes were fitted with the Maneuvering Characteristics Augmentation System (MCAS), a newly upgraded system created to push the nose of the plane down should the aircraft get to an altitude that would cause it to suddenly stall.
Boeing was criticized after the Lion Air crash for allegedly failing to adequately inform 737 pilots about the functioning of the stall prevention system.More news: Five dead, 36 injured in foot bridge collapse in Mumbai