From Fortune:

A series of errors and mishaps with Boeing Co. aircraft have put the biggest US exporter’s manufacturing prowess in jeopardy. Regulators grounded 171 of the 737 Max 9 variant after a fuselage section was ejected during an Alaska Airlines flight, terrifying passengers at 16,000 feet. Shares of Boeing fell 7.9% in premarket US trading.

This is the latest in a series of incidents that have caused 737 Max aircraft to suffer a crisis in confidence. The Alaska Airlines incident brought fresh scrutiny to Boeing’s relationship with Spirit, its biggest supplier. Investors are assessing the impact on production and Boeing’s long-term outlook. While Boeing CEO Dave Calhoun is working to stabilize the company after five years of upheaval, such incidents threaten to derail his efforts.

Customers and investors are troubled by the spate of quality lapses in Boeing’s aircraft. After a door-shaped panel ripped out from the 737 Max 9 during a flight in Portland, Oregon, investigators are examining what led to the panel’s blowout. Boeing’s biggest supplier, Spirit AeroSystems Holdings Inc., which installed the panel on the nearly new jet, slid 16% in trading.

Boeing is summoning employees to an all-hands meeting to discuss the near-tragedy and reinforce commitment to safety, quality, and transparency. Tempers are frayed due to the resemblance of this incident to the faulty bolts and holes drilled in other aircraft. Boeing, which has made progress in recent years, is now under scrutiny and will face further delays due to this incident.



Read more: Boeing CEO Dave Calhoun had a plan to make 2024 the planemaker’s turnaround year