On Friday, a fuselage panel blew out on an Alaska Airlines Boeing 737 Max 9 plane seven minutes after takeoff from Portland, Oregon. The rapid loss of cabin pressure pulled the clothes off a child and caused oxygen masks to drop from the ceiling, but miraculously none of the 171 passengers and six crew members were injured. Hours after the terrifying incident, Alaska Airlines announced that it would ground its entire fleet of 65 Max 9s for inspections and maintenance. But how did this malfunction occur and how likely is it to happen again? Why did a panel blow out on a Boeing aeroplane?On Sund…