What happened to Alaska Airlines’s Boeing 737 Max 9 whose door blew off?

An order by US officials to ground 737 Max 9s for inspection will affect 171 aircraft worldwide.

A cabin panel flew off in midair during an Alaska Airlines flight, leaving a gaping hole in the plane’s fuselage and forcing an emergency landing.

The incident took place on Saturday. Social media images showed emergency oxygen masks hanging from the ceiling as passengers huddled in their seats in trepidation.

Here’s what you need to know about the incident, and the Boeing 737 Max 9 jetliner: