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Holdrooms Model Holdroom sizing is typically based on the average seating capacity of the largest aircraft expected to use each gate. Holdrooms are typically sized for LOS C, with some airports choosing to provide a higher LOS. However, LOS in holdrooms does not, at this time, have a formally accepted definition. LOS parameters have been derived from generally accepted industry practices and are a combination of the following three factors: Load factor for the aircraft typically expected to use the gate: Typical ranges are 80% (LOS B/C) to 90% (LOS A). The design load factor may be reduced, however, if a significant number of passengers are expected to be using close-by concessions or waiting in airline clubs and/or premium class lounges (international flights). Percentage of passengers to be seated in the holdroom versus standing: This percentage can range from 50% seated (LOS C) to 80% (LOS B), or even 100% (LOS A). Again, these are typical ranges and should take into consideration the same factors as the load factor discussed above. Area per seated and standing passenger: Area per passenger is typically 15 square feet seated and 10 square feet standing (LOS B/C). This guideline can be increased to 17 square feet seated and 12 square feet standing (LOS A) to provide wider aisles, and/or more flexible seating configurations. These factors that determine the total seating/standing lounge area of the holdroom are used in the Holdrooms model, where the user sets the LOS conditions and determines the suggested holdroom size. The area for gate check-in podium(s) and queue(s) should be added to the passenger seating area. The gate podium provides facilities for airline agents to check passengers in, change seat assignments, and provide other passenger services. The number of agent positions is a function of aircraft size and airline staffing policies, but are typically as follows: one for commuter aircraft, two for narrowbody (up to 150 seats), three for widebody and B757 aircraft, and four for jumbo aircraft (over 300 seats). In addition to the passenger seating area and check-in area, a boarding/deplaning corridor should be added to the lounge area which effectively acts as an extension of the loading bridge door. If a gate has multiple loading bridges, each bridge should have a separate boarding cor- ridor. Depending on the configuration of the holdroom and the proximity of the check-in podium queue to the loading bridge entrance, some additional queuing may be provided for the boarding process. However, few airports or airlines have seen a need for this additional queuing area. The Holdrooms model is organized like the other spreadsheet models with the same color-coded user cells and links to the Table of Contents and to the User's Guide as seen in Figure 61. 48