From Investing.com:

The FAA has grounded certain Boeing 737 MAX jets after an incident during a flight, prompting immediate inspections and investigations by regulators and airlines. The emergency landing was caused by a section of the aircraft detaching midair. United and Alaska Airlines, the largest customers of the affected model, could face significant disruptions. Boeing is actively gathering information and working with the airline involved.



Read more: FAA grounds certain Boeing 737 Max 9 jets after Alaska Air incident By Investing.com