The US Federal Aviation Administration intends to intensify scrutiny of United Airlines' operations in response to a recent series of incidents. On 23 March, the FAA said that after "recent safety events" it was "increasing oversight of United Airlines to ensure that it is complying with safety regulations; identifying hazards and mitigating risk; and effectively managing safety". The regulator adds: "Certification activities in process may be allowed to continue, but future projects may be delayed based on findings from oversight." Additionally, the FAA plans to initiate an evaluation of United under the provisions of the Certificate Holder Evaluation Process, which provides the Flight Standards Service with policies and procedures to evaluate certificate holders. The FAA lists multiple incidents involving United aircraft this month. A Boeing 737-900 scheduled to arrive on 4 March at Southwest Florida International in Fort Myers returned to Houston after the crew reported an engine issue. A 777 operating a 7 March flight from San Francisco to Osaka in Japan was diverted to Los Angeles after the crew reported a landing-gear issue. An Airbus A320 that on 8 March departed San Francisco and was scheduled to arrive in Mexico City was likewise diverted to LA after the crew reported a hydraulics issue. After landing at Houston George Bush Intercontinental on 8 March, a 737 Max 8 that had departed Memphis rolled into grass when exiting onto the taxiway. An A320 scheduled to arrive in Salt Lake City on 9 March returned to Chicago O'Hare after the crew reported a possible oil warning light issue. The crew aboard an A320 flight from Dallas/Ft Worth to San Francisco on 14 March reported a possible hydraulics issue.
On 17 March, crew members aboard a 737-800 flight from New York LaGuardia to O'Hare reported an issue with the air data indication. On 18 March, a Boeing 767 flying to London Heathrow returned to Newark Liberty after the crew reported a possible landing-gear issue. United on 22 March told employees in a memo shared with Cirium that "the number of safety-related events in recent weeks have rightfully caused us to pause and evaluate whether there is anything we can and should do differently". The carrier acknowledges in the memo that it "will begin to see more of an FAA presence in our operation as they begin to review some of our work processes, manuals and facilities", adding: "We welcome [the FAA's] engagement and are very open to hear from them about what they find and their perspective on things we may need to change to make us even safer. As part of this effort, the FAA will also pause a variety of certification activities for a period of time."