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The Joint Primary Aircraft Training System (JPATS) body size cases provide aircraft designers access to representative Airmen anthropometric dimensions based on a database of air force personnel. To ensure new aircraft can support a broad range of pilot body sizes, designers can reference JPATS case numbers to assure adequate access to specific controls and clearances for ejection. JPATS cases 1 and 7 were added in response to the Air Force’s goal to accommodate 95% of males and females. However, given that someone at the 90th percentile height may not have 90th percentile arm length, a far smaller percentage of accommodation than originally projected is actually achieved. This paper presents a discussion of the limitations of JPATS cases and past evaluation methods, and provides recommendations for methods to utilize during the design process to ensure next generation cockpits can accommodate a broader range of body sizes.