This paper describes emotional body expressions by flying robots for displaying emotions. Subjective evaluation experiments were performed to clarify the relation between movement parameters and subjective feeling of the expressions. Emotional body expressions were designed by eight people. The expressions were evaluated by another group of twelve people, who answered a questionnaire. The elements of emotional body expressions were investigated using the Lasso method. The results indicate movements that are most effective for displaying a particular emotion to a human. Such expressions are expected to enhance communication between the flight robots and humans.