UAxpan is an innovative concept for a UAS Demand Generator that is directly related to fostering NASA's achieving results in driving UAS integration in the NAS. Our UAS demand forecast system will provide valuable input to the R&D being performed by the NASA UAS Program. The Control & Communications Project (NASA GRC) and the Certification & Safety Project (NASA LaRC) will directly benefit by having the number UAS forecasted operations soundly based upon real world constraint knowledge and industry SMEs and based upon industry markets, UAS types, use by mission, and discrete airspace classes associated with geographical location and time. This forecast data is needed to validate the communication systems engineering work on channel bandwidth sizing, signal-in-space specification (especially for shared channel access techniques) and for planning of spectrum reuse. Without this UAS demand data the selection of differing approaches to form consensus on standards for civil aviation will be delayed. The UAxpan project will also be essential in the development of another NASA emerging project for the UAS Traffic Management (UTM) System which is targeted to enable low-altitude civilian applications of UAS. The UTM will greatly benefit from accurate forecast of planned UAS use in low altitudes as input data to traffic flow and control simulations. The UAS demand tool, UAxpan, will provide valuable forecast data to non-NASA users in the Federal Government (FAA, DHS, DOT, EPA, DoA, DoI), Armed Services, state and local governments, universities, standards organizations (RTCA, ICAO, AEEC, AUVSI, JARUS) and defense and commercial business. All these organizations need to support investment planning, perform engineering, determine market needs, or establish international standards and agreements based upon the projected use of UAS which goes beyond just having aggregated U.S. totals. The U.S Congress is driving the introduction of UAS through the FAA Reauthorization Act of 2012 and their staffs would be able to benefit from UAS projections by industry and governing domains. UAxpan will also be the source of analytics and projection data that can be offered to users through the emerging "big data" businesses. These firms are offering aviation system information to operational research staffs of major airlines or airport operators for the purpose enhancing operation effectiveness.