“Controlled flight into terrain” is a term that refers to an airplane crash where a pilot accidentally directs an airplane right into the ground (or a hill, or the water, or anything else, really). CFITs tend to happen in bad weather, or when guidance equipment fails in a key way that isn’t noticed by the people using that equipment to land or take off in a plane. In 1936, a deposed German prince — Adolf II of Schaumburg-Lippe — died when his airplane took a CFIT … into a volcano.