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14 Airport Passenger Terminal Planning and Design Figure 13. Tab 5 example of the Design Hour Determination model. Tab 6, as shown in Figure 15, graphically illustrates the rolling hour data from Tab 5. The data included in Tab 6 charts is for total activity (domestic, international, air carrier, and regional) but can be modified by the user to illustrate any subset of data from Tab 5. As shown, the design hour usually does not occur within a clock hour, but across two clock hours. The final tab in the Design Hour Determination model allows the user to see the calculated planning factors for peak month, average day, and design hour, and the effect that these factors can have on the design hours used in future planning levels. Knowledge of these average values for planning factors and understanding their impact can allow the user to make valid use of them in the absence of a design day schedule. The planning factors from the design hour exercise are boxed in red on Figure 16, which is a screen print of Tab 7. Factor Analyses Generally, historic data on aircraft activity at the airport in question or a comparable facility can be used to derive planning factors that are used to divide annual demand into average day of the peak month (ADPM) and average day peak hour (ADPH) values. Analysis of U.S. Depart- ment of Transportation (U.S.DOT) databases on origin and destination (O&D) travel (10% ticket Figure 14. Example of peak buckets.