"NTSB Investigates Loose Bolts on Boeing 737 Max 9s, Impacting Boeing and Spirit Stocks"

Loose fasteners discovered during 737 Max 9 inspections have led to the grounding of all Boeing 737 Max 9 model aircraft by the FAA, following an emergency landing due to a depressurization incident. Alaska Airlines and United Airlines reported loose parts during inspections, with Alaska Airlines canceling flights. The incident is under investigation, and Boeing and Spirit AeroSystems stocks fell as a result. This comes after previous issues with the 737 Max series, and Boeing's supplier, Spirit, has faced production challenges.