The Symptoms of Stress questionnaire was administered to three random samples of commercial airline pilots. Respondents included 1 group of 212 pilots who were employed by an airline company with a history of corporate instability; and 2 groups, totalling 220 pilots, who were employed by 2 airline carriers with histories of corporate stability. The pilot group employed by the airline with a history of corporate instability reported significantly more stress and depression symptoms and a greater accumulation of symptoms than did the pilot groups employed by the stable airlines. With the advent of airline deregulation and its concomitant changes in the airline industry, including corporate instability, we conclude that the relationship between corporate instability within the aviation environment and the subjective distress reported by pilots suggests the need for further investigation into implications for health and safety.