Comments and opinion from plots, engineers and others is raising the most disturbing concern about air safety. In the linked CBC story, airline consultant Keith Mackey says simply that Boeing “forget to tell pilots” about software that altered the flying characteristics of the 737 Max 8 and 9 As publicised earlier, the Max models included a modification to engine pods and landing gear to make the plane more fuel efficient. But those changes also changed the aircraft’s centre of gravity. That made the nose of the 737 Max tip too far upward during ascent, risking a stall. New software was designed to automatically bring the nose of the aircraft down. Such an override response it seems might cause a pilot to become confused and struggle with the software. This appalling scenario seems incredible and yet it is what some people are saying about the cause of the two crashes.