1. "Fear of flying," implying emotional symptoms sufficient to threaten or impair flying proficiency, was infrequent in Korea during 1953 and early 1954. Fifteen cases were referred for psychiatric appraisal in a 17-month period.2. The process of attaining a calm, mature approach to flying, in pilots and passengers, involves passing through certain distinct stages during which the mechanism of repression is operative.3. Development of typical fear of flying reactions is discussed and exemplified by illustrative case histories.