Canada joined the nations banning the aircraft Wednesday, which leaves the United States as the lone major nation still allowing the aircraft to fly.
"Boeing has lost control of the timetable to provide the safe, reliable solution", said Neil Hansford, chairman of the Australian consultant Strategic Aviation Solutions. "Safety is a core value at Boeing for as long as we have been building airplanes; and it always will be".
"There is no greater priority for our company and our industry".
The company says in the aftermath of October's Lion Air Flight crash, it has for several months "been developing a flight control software enhancement for the 737 MAX, created to make an already safe aircraft even safer".
"There must be a rigorous investigation into why the aircraft, which has critical safety systems that did not exist on prior models, was certified without requiring additional pilot training", he said.
OTTAWA-Marc Garneau, Minister of Transport, issued the following statement Wednesday morning when he grounded Boeing 737 Max 8 and 9 aircraft in Canada following a crash of the plane in Ethiopia Sunday that killed all people aboard. "They have the capacity to respond to that", Mr Iwarah said. "The plane rotated two times in the air, and it had some smoke coming from the back then, it hit the ground and exploded", farmer Tamrat Abera said.
"The FAA continuously assesses and oversees the safety performance of US commercial aircraft", the agency said in a statement. After the FAA gave the Boeing plane the all-clear, Australian aviation authorities still made a decision to ground the planes.
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"What we can say is we don't have the capability to probe it here in Ethiopia", he said. "We very much worked in conjunction with Canada". Thailand ordered budget airline Thai Lion Air to suspend flying the planes for risk assessments.More news: Donald Trump says he meant to call Apple CEO 'Tim Apple'
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Most airlines have spare planes positioned throughout the country to deal with mechanical and weather delays, he said.
Tewolde said he is confident the "investigation will reveal that the crash is not related to Ethiopian Airlines' safety record".
Since the Indonesia crash, there has been a focus on an automated anti-stall system in the 737 MAX that dips the aircraft's nose down.
Anxiety was also evident among travellers, who rushed to find out from social media whether they were booked to fly on 737 MAX planes - the same model involved in the Lion Air crash off Indonesia that killed 189 people in October.
The agency said in a statement it was "taking every step necessary to ensure the safety of passengers". "It has something that has viscerally caught the attention of Canadians", he said.
"But at the end of the day, these sorts of issues are usually resolved with the fact that they're still flying in the US suggesting this will be the ultimate outcome", Raviv said in a note to clients.
Federal reports obtained by CNN revealed that US pilots complained about the MAX 8 in the past.
Southwest is the world's largest operator of the 737 MAX 8 with 34 jets, while American flies 24 MAX 8s and United 14 MAX 9s.
On Tuesday, Toronto-based Sunwing Airlines Inc. said it has "suspended" flights of its four Max 8 jets due to "evolving commercial reasons", joining dozens of airlines and countries in halting the use of the new planes amid safety concerns.