Chief Executive Dennis Muilenburg, who has repeatedly rejected suggestions of a design flaw in the 737 MAX, acknowledged implementation shortcomings.
Acting head of US Federal Aviation Administration Daniel Elwell says, "We can't be driven by some arbitrary timeline."
The FAA is meeting with more than 30 international air regulators including China, the EU, Brazil and Canada on Thursday to discuss a software fix and new pilot training that Boeing has been developing to ensure the jets are safe to fly.
Lilium hopes to bring into service a battery-powered aircraft by 2025 to whisk passengers between cities at a price comparable with taxis.
A Reuters poll shows people are not familiar with airplane crashes in Indonesia and Ethiopia and are more concerned with ticket prices when they choose an airline.
The plane carrying 143 people including crew members, crashed into the St. Johns River at the end of the runway at Naval Air Station Jacksonville injuring 21 people.
Muilenburg said Boeing followed the same design and certification process it has always used and denied that the MAX was rushed to market. He said he would not resign, and left a press conference as reporters peppered him with questions.
The aviation giant announced on Wednesday it has suffered $1 billion after two deadly Boeing 737 MAX crashes. The company officials said they need to win back consumers' trust again.
The US wants to tax $11.2 billion worth of EU goods from jets to Cheese. The US tariff wish-list reflects Trump administration's calculation of the harm EU subsidies have inflicted on the US
Boeing announced it would cut the production of its 737 aircraft line following the two recent crashes that have seen the 737 MAX grounded worldwide.
Boeing share prices have struggled as the company loses the trust of the regulators and airlines in light of recent air crashes involving its 737 MAX planes.
Airlines worldwide grounded the jet after the deadly crash of an Ethiopian Airlines flight this month. It came less than five months after 189 people died in the October crash of another Max 8 off the coast of Indonesia.
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