"Alaska Airlines: Cockpit Audio Loss and Safety Debate Renewed"

The cockpit voice recorder from the Alaska Airlines flight that made an emergency landing in Portland was erased, hindering the investigation into the midair incident where a door plug blew off. The NTSB chief expressed frustration over the loss of crucial audio and called for longer recording times. The plane had been restricted from long flights over water due to a recurring warning light, and the door plug was found by a Portland teacher. Both Alaska and United Airlines have grounded their Boeing 737-9 Max aircraft for inspection, while investigators continue to search for clues to determine the cause of the incident.