The terrorist events of September 11, 2001, indirectly brought attention to the problem of fear of flying. Specific phobias, such as fear of flying, are generally treated by exposure therapy, a form of behavior therapy. The effectiveness of behavioral treatment is supported by data collected from physiological, behavioral, and self-report measures. The relationship of these three measures to outcome are discussed in a case example of a male subject successfully treated for fear of flying with behavioral therapy.