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airport, averaged for two adjacent peak hours of a <br />typical high activity day (use the 37th high activity <br />day of the year) . Identify busy -hour operations by <br />each category of major user. <br />e. Based Aircraft. Total number of active gen- <br />eral aviation and air carrier aircraft which use an <br />airport as "home base" and have a current airworthi- <br />ness certificate. Based aircraft should be categorized <br />by gross weight, number and type of engines, and air <br />carrier or general aviation use. <br />24. Aircraft Mix. In determining and planning <br />for future airport facility ' requirements, it is necessary <br />to forecast the types or categories of aircraft (aircraft <br />mix) which are to be accommodated at the airport or <br />location under consideration. <br />Therefore, it is essential to keep abreast of tech- <br />nological advances in aircraft design (such as the <br />SST, large capacity subsonic transport aircraft, <br />V/STOL, airbus aircraft, etc.) in order to insure the <br />provision of adequate airfield and terminal design at <br />the airport from which they are to operate. Generally, <br />passenger and cargo volume forecasts will indicate the <br />14 <br />types of terminal facilities required, whereas, the <br />number of aircraft operations by type will establish <br />airfield configuration requirements. <br />25. Aviation Demand For Air Transporta- <br />tion Hubs. The FAA reports, "Aviation Demand <br />and Airport Facility Requirement Forecasts for Large <br />Air Transportation Hubs Through 1980," August <br />1967, and "Aviation Demand and Airport Facility <br />Requirement Forecasts for Medium Air Transportation <br />Hubs Through 1980," January 1969, are available as <br />guides in the development of operational activity <br />forecasts. Appendix 1 of the "Medium Hub" publi- <br />cation contains methodology developed by the FAA <br />to obtain unconstrained aviation demand forecasts and <br />illustrate how to apply various forecasting techniques. <br />Also, the reference material and source documents <br />used are listed with each method. These methods and <br />techniques were developed primarily to obtain aggre- <br />gate aeronautical activity forecasts for each large hub <br />location. With some modification, they can be ap- <br />plied to almost any airport or location that requires <br />aviation demand forecasts. <br />