... xiAnalysis of Small Aircraft Transportation System Concept97Box 4-1Brief Primer on Transportation Demand StudiesDemand studies are used to evaluate the market for transportation technolo-gies ... Air Transportation Challenges: Enhancing Capacity, Service, Safety, and Environmental Compatibility 50Congestion and Delay in Commercial Air Transportation, 51Small-Community Access to Air Transportation, ... Office of the Secretary of Transportation, U.S.Department of Transportation, June.1070552-05 Ch04 5/2/02 2:32 PM Page 107Future Flight: A Review of the Small Aircraft Transportation System ConceptCensus...