US probing Boeing's supply chain for Malaysian-made door plug

The Boeing BA 737 MAX 9 door plug that blew out during a harrowing Alaska Airlines flight earlier this month was manufactured in Malaysia, said the US National Transportation Safety Board (NTSB).

According to the Wall Street Journal, NTSB chairperson Jennifer Homendy said that Spirit AeroSystems produced the door plug in Malaysia.

It was then transported to the...