From CNBC:

The FAA has stopped Boeing’s 737 Max production expansion after a door plug blew out during an Alaska Airlines flight. FAA Administrator Mike Whitaker stated that Boeing will not resume normal production until quality control issues are resolved. Boeing’s shares fell 4% in after-hours trading. The FAA also approved inspection instructions for the Max 9 aircraft, which had been grounded after a fuselage panel blew out in Portland, Oregon on January 5, causing United and Alaska to cancel hundreds of flights. United and Alaska’s CEOs expressed frustration with Boeing after the issue.



Read more: FAA halts production expansion, OKs inspection instructions