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Holdrooms Model 49 Figure 61. Holdrooms model. Single Holdroom Approach The Holdrooms model shown in Figure 62 requires that the user input aircraft and load fac- tor information and, by using the LOS guidance in the cell comments, select the percentages and criteria that will determine the holdroom areas. By adjusting the factors that increase or decrease the suggested holdroom area, the user can observe the effects that properly accounting for the amenities, utilization, and sharing factors can have. Holdrooms are recommended to be paired or grouped to allow better flexibility of use. Group- ing makes it possible to reduce the total amount of holdroom space at many airports. One rule of thumb is to reduce the holdroom seating area by 5% for each gate in a common holdroom group. The amount of area reduction (for the passenger seating/standing area only) should be related to differences in departure times for adjacent gates, the estimated passenger arrival time distribution at the holdroom, and boarding time prior to departure. Thus, a reduction in seating area might not be recommended when near-simultaneous departures are expected. Examples would include a connecting hub airport, and some spoke airports, when all of the carriers schedule departures at the same time. If departure times are very well spaced, the area reduction may be greater than the rule of thumb. Figure 62. Example of single holdroom approach.