Boeing Co (NYSE: BA) issued a Multi-Operator Message (MOM), in consultation with the Federal Aviation Administration (FAA), urging newer single-aisle airplane operators to inspect possible loose hardware in 737 MAX aircraft. Notably, Boeing asked for the inspections after an international operator discovered a bolt with a missing nut while performing routine maintenance on a mechanism in the rudder-control linkage. According to a statement from the FAA, the company also discovered an additional undelivered aircraft with a nut that was not properly tightened. The FAA said it will remain in cont…