"Unresolved Concerns: Investigation Continues into 737 Max Part Failure on Alaska Flight"

The National Transportation Safety Board (NTSB) is investigating the recent in-flight blowout of a Boeing 737 Max 9 to determine if bolts were installed on the part that blew off, while the Federal Aviation Administration (FAA) is expanding its probe into Boeing's quality control and investigating contractor Spirit AeroSystems. Shareholders of Spirit AeroSystems have filed a federal lawsuit alleging widespread and sustained quality failures, and the company has previously identified production issues on certain 737 models.