"Boeing 737 Max Issues: NTSB Reveals Safety Concerns and Alaska Air Blowout"

United Airlines found loose bolts and installation issues on some Boeing 737 Max 9 jets after a mid-flight blowout on a similar Alaska Airlines jet. The Federal Aviation Administration grounded all Max 9s operated by Alaska and United and some flown by foreign airlines. The incident raised concerns about the safety of Boeing's 737 Max jets, leading to flight cancellations and stock price drops for Boeing and Spirit AeroSystems. The National Transportation Safety Board is investigating the incident, and Boeing CEO Dave Calhoun called for transparency and cooperation with regulators to address the causes and prevent future accidents.