FAA has doubled its enforcement cases against Boeing since a door plug blew off a 737 Max

A federal Aviation Administration official said Wednesday that the agency has 16 pending enforcement cases against Boeing, half of which have been opened since a door plug blew off a 737 Max in midflight.

The increase in cases was disclosed Wednesday during a National Transportation Safety Board hearing into the accident, which happened during an Alaska Airlines flight on Jan. 5.

Brian Knaup, who helps manage the FAA’s oversight of Boeing, said one of the open cases involves the...