FAA will review United Airlines' safety procedures, according to a letter sent by an airline vice president to staff. United Airlines owns the largest fleet of 737 MAX 9s, with 79 of these aircraft.
In late February, United Airlines pilots reported that the rudder pedals of their 737 MAX were stuck after landing in Newark, New Jersey. Other incidents have been reported, such as a missing panel on a plane, or the loss of a wheel during takeoff. The FAA will also suspend various certification activities for a period of time.