Many airlines around the world have grounded the Boeing jetliner and many countries, including the entire European Union have barred the plane from their airspace, leaving the United States as one of the few areas where the plane can fly.
He said they have been assured of regular updates.
In the US, American Airlines and Southwest Airlines operate the Max 8 and United Airlines flies a slightly larger version, the Max 9.
It is unusual for black boxes - actually orange to aid their recovery - to be sent to a country not directly involved as the location of a crash, the place of registration of the aircraft, or in a manufacturing capacity, the AAIB said.
The U.S. aviation system is essentially governed through cooperative and voluntary relationships between the government and manufacturers, Goelz said.
There is no evidence yet whether the two crashes are linked.
"A Boeing technical team will be travelling to the crash site to provide technical assistance under the direction of the Ethiopia Accident Investigation Bureau and US National Transportation Safety Board", a statement released on Sunday read. And Nikki Haley, Trump's former United Nations ambassador, has been nominated to join Boeing's board.More news: New York Attorney General Opens Investigation into Major Trump Organization Projects
In a post he titled, "My Lucky Day", Mavropoulos, who is from Greece, talked about how he said he arrived at the gate just minutes after it was closed. "Both times, the crew disengaged the autopilot and were able to keep flying safely", NPR's Russell Lewis reports.
On Tuesday, the European Union's aviation safety regulator suspended all flights in the bloc by the 737 MAX and a USA senator who chairs a panel overseeing aviation suggested the United States take similar action. It comes after Sunday's Ethiopian Airlines crash.
He said he was taken to the airport police department to verify his identity and was questioned for being the lone passenger who did not board the doomed flight.
Norwegian Air said it would seek recompense for lost revenue and extra costs after grounding its 737 MAX aircraft. Kayak.com was the first big site to say it would modify filters to allow customers to exclude particular types of planes from queries.
"He was having difficulties with the flight control of the airplane, so he asked to return back to base", Mr GebreMariam said.
The three USA 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.
The investigation into the Ethiopian crash is still in its early stages, and experts have warned against drawing conclusions, despite similarities between the two deadly disasters.