Chapters 1 and 2 explore the Lion Air Flight 610 and Ethiopian Airlines Flight 302 accidents, the resulting international grounding of the Boeing 737 MAX aircraft, and actions needed to ensure the safety of the aircraft before returning them to revenue service. Because of apparent similarities in factors that may have contributed to the Lion Air Flight 610 and Ethiopian Airlines Flight 302 accidents, the FAA Associate Administrator for Aviation Safety established a Joint Authorities Technical Review (JATR) to review the type certification of the flight control system on the B737 MAX. Chapter 3 discusses the recommendations pertaining to that review.