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Design Hour Determination Model 15 Figure 15. Design Hour for departing passengers. survey) and connecting travel can be used to derive factors that calculate connecting versus O&D traffic flows. Factor analysis at airline connecting hubs can yield poor results, if the factors are not calibrated with other locally available data. Regardless of the analysis method used to derive the design hour volumes of passenger and aircraft activity, the method used to create the analysis must be calibrated against data or observa- tions that describe actual operations at the airport. Passengers: Originating versus Connecting After determining the total number of passengers from the design hour seating capacity of the aircraft, it is usually appropriate to divide this volume into O&D passengers and connecting pas- sengers. Connecting passengers usually stay on the airside area of the terminal while the O&D passengers make use of both the airside and the landside areas of the terminal. The only time connecting passengers make use of the landside facilities is when they change airlines and the second airline's gates are located in a different concourse and there is no airside passageway con- necting the two concourses. Connecting passenger volumes tend to vary considerably from airline to airline. In general, the larger volume of flight activity the airline has at an airport, the greater the likelihood that connecting passengers will be part of their total passenger volume. Information on connecting passenger volumes should be collected from the airlines.
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16 Airport Passenger Terminal Planning and Design Figure 16. Peak factors.