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Boeing 737 Max planes are grounded after a hole blew in one mid-flight
(www.theverge.com)
This is a most excellent place for technology news and articles.
Door plug means that it's a spot in the frame where a future door can be installed by removing the "plug". In the meantime, it just looks like a piece of the fuselage. The plug is what got ripped out midair.
Oh my bad