Two analyses were conducted on three datasets from a series of aviation human factors experiments focused on the development and testing of measures of flight display clutter as well as the relation with flight task performance. The objectives of this study were to assess the effects of cockpit display dynamics and aircraft type on pilot perceptions of display clutter in simulated flight tasks through statistical analyses of the data gathered across the experimental studies. Comparisons were made on observations of pilots with comparable experience under similar headup or headdown display conditions. In general, this research demonstrated the clutter measures to be highly sensitive to aviation display and domain conditions. The findings also indicated that human information processing considerations in aviation display design coupled with attention to the visual characteristics of display features may provide an effective basis for mitigating potential effects of clutter on pilot performance.