When we read about airplane accidents, the persons involved may appear as two-dimensional beings defined by one or more characteristics—impatience, laziness, ignorance—or as faceless figures with no characteristics at all. But real people, and the situations in which they find themselves, possess many complexities. All the more when the cast consists not of a single pilot but of a whole group of pilots and their passengers, many of whom are pilots themselves. Many accidents have demonstrated that the presence of multiple pilots, when they are not operating as a disciplined crew, does not increase the safety of a flight.