Imagine being mid-flight when a part of your plane rips out, leaving a yawning hole at 16,000 feet above ground. On a January 5 Alaska Airlines flight, the emergency door plug — usually fitted seamlessly into the aircraft’s fuselage — on the Boeing-made plane blew out. Luckily, the seat next to the panel was empty, and there were no fatalities. Federal investigators are still trying to figure out exactly why the door plug didn’t stay put. Boeing’s reputation in the public, meanwhile, has taken y...