The Federal Aviation Administration (FAA) has ordered the grounding of over 170 Boeing 737 Max 9 aircraft for inspections after a panel on an Alaska Airlines plane blew out midflight. The incident occurred on Alaska Airlines Flight 1282, which made an emergency landing with no serious injuries reported. The FAA's emergency airworthiness directive affects about 171 planes worldwide, and both Alaska and United Airlines have grounded their entire fleets of Boeing 737 Max 9s. The National Transportation Safety Board has started its investigation into the incident.