On Friday, 20 minutes after takeoff and at an elevation of 16,000 feet, a door plug on the side of Alaska Airlines Flight 1282 ripped off midair. As oxygen masks dropped from the ceiling, some of the 171 passengers took videos on their phones of the gaping hole in the side of the jet.
After quickly circling back to Portland, Ore., the plane landed safely. Now all the attention is on what could have happened aboard that Boeing 737 Max 9.