[Here’s what travelers should know.]

Officers analyzing the Lion Air crash have raised the chance that a new flight-control system may have contributed to that earlier accident. As they banned flights by the plane this week, some security regulators cited issues that pilots could be unable to deal with the plane in the event that they got inaccurate alerts from key flight devices.

The accidents have put Boeing on the defensive. The 737 Max is Boeing’s best-selling jet ever and anticipated to be a serious driver of revenue with round 5,000 of the planes on order. Its shares have fallen about 13 p.c this week.

[Two Times reporters flew on Boeing 737 Maxs the day before the planes were grounded in the United States.]

Following the Indonesia crash, Boeing was anticipated to replace its software program and coaching tips in order that airways can train their pilots to fly the planes extra safely and simply. That software program replace is deliberate for April.

“Boeing is an unimaginable firm,” Mr. Trump mentioned. “They’re working very, very onerous proper now and hopefully they’ll in a short time provide you with the reply, however till they do, the planes are grounded.”

On Tuesday morning, Boeing’s chief govt, Dennis A. Muilenburg, had known as Mr. Trump to personally specific his confidence within the security of the jets, in accordance with two individuals briefed on the dialog.

The temporary name had already been within the works, but it surely occurred to come back shortly after Mr. Trump raised issues that airplanes have been turning into too complicated to fly and subsequently endangering passengers. “Pilots are now not wanted, however somewhat pc scientists from MIT,” he wrote on Twitter.

Boeing mentioned it supported the choice to floor the planes.

“We’re supporting this proactive step out of an abundance of warning,” Mr. Muilenburg mentioned. “We’re doing every thing we will to grasp the reason for the accidents in partnership with the investigators, deploy security enhancements and assist guarantee this doesn’t occur once more.”


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