The FBI is investigating a January 5 incident in which a Boeing door came loose on a plane. No one was seriously injured, but the 737 MAX 9 had to make an emergency landing.
Images of the terrified passengers sitting next to the gaping hole in mid-flight went viral around the world. Several bolts supposed to secure the cap holder were missing, according to the American Transportation Safety Agency (NTSB), which blamed Boeing. The aircraft manufacturer was particularly criticized for the slowness of its cooperation with the authorities.