NTSB

A two-day hearing by federal investigators could provide new insight into the accident that caused a loud boom and left a gaping hole in the side of the Alaska Airlines jet.

The National Transportation Safety Board has released its preliminary report into the fatal plane crash of former astronaut William Anders.

About 170 planes were grounded after the "door plug" on a Boeing 737 Max 9 blew out on an Alaska Airlines flight. United and Alaska are the two big U.S. carriers that fly Boeing jets with door plugs.

The auto pressurization light came on during three recent flights involving the same plane, the National Transportation Safety Board said. Some plane components are being sent to an NTSB lab.

U.S. investigators have confirmed that a mechanical issue caused the seaplane crash that killed 10 people off an island in Washington state last year.

The Federal Railroad Administration says many railroads are behind schedule in installing technology that could prevent crashes. It would slow or stop a train if the human operator failed to do so.