[HIGHLIGHTS] Unhooking a Boeing door: passengers may be victims of a crime, according to the FBI

Alaska Airlines Boeing plane lost a "cap holder" in mid-flight on January 5. No one was seriously injured, but the 737 MAX 9 had to make an emergency landing.

The passengers recently received a letter from the FBI, which is investigating the matter. Several bolts supposed to secure the cap holder were missing, according to the American Transportation Safety Agency (NTSB) The aircraft manufacturer was particularly criticized for the slowness of its cooperation with the authorities, the NTSB said.