Boeing and Alaska Airlines are facing legal challenges and investigations following an incident where a door-plug blew out of a Boeing 737 Max 9 jet during an Alaska Airlines flight on January 5, causing injuries to passengers. Both companies have denied legal responsibility for the incident. The National Transportation Safety Board (NTSB) and federal prosecutors are investigating the matter, with difficulties arising due to missing records documenting who worked on the aircraft. A lawsuit representing seven passengers has been filed in Washington’s King County Superior Court against both companies and others, with one passenger, Cuong Tran, citing loss of his iPhone and a shoe during the incident. The Justice Department has also convened a grand jury in Seattle and is issuing subpoenas as part of a criminal investigation into the incident.