The Justice Department has launched its investigation into Boeing after a door blew off an Alaska Airlines 737 MAX 9 mid-flight last month. This comes as the Federal Aviation Administration gave the company a 90-day deadline for presenting a safety plan that meets current standards for new planes. A recent report by the FAA found Boeing’s safety culture to be “inadequate” and “confusing.” Last week, Boeing announced it was replacing the head of its 737 MAX program.