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For system planning purposes, airfield capacity is typically expressed in an annual measure. The methodology used to estimate airfield capacity and associated aircraft delays in this study is based on each airport's physical layout and its operational chazacteristics. This capacity methodology is documented in FAA Advisory Circulaz 150/5060-5, "Airport Capacity and Delay." (1) Annual Service Volume Annual service volume (ASV) is defined as a reasonable estimate of an airport's annual operating capaaty as defined by its ability to process aircraft activity on a continual basis. Operational capacity can be used as a reference point for general planning to determine when system .enhancement is required from an operational perspective. As annual aircraft operations approach an airport's ASV, annual aircraft delays increase rapidly, with relatively small increases in aircraft activity. Under normal conditions, the FAA recommends that planning for additional capacity should begin when actual annual operations reach 60 percent of ASV. When the number of annual operations equals approximately 80 percent of the ASV, additional capacity should be available. Providing additional capacity is typically accomplished through airfield improvements such as parallel rumvays or taxiways. Capacity saturation can also be addressed through methods of demand management. The capacity of each reliever system airport for the 20-yeaz planning period was identified by analyzing its existing rttttway/taxiway configuration and operating fleet mix and relating these individual airport characteristics to specific ASV estimates prepared by the FAA. 1. Rumvay/Taxiway Configuration Runway/taxiway configuration is the physical layout of runways and taxiways, including their number, orientation, location, and separation. Each configuration has a different capacity. Airport capacity increases with each additional rumvay depending on its wind coverage and its location in relation to other existing runways. Parallel nmways tend to have the highest operational capaaty; the capaaty of parallel rumvays also increases with the III-2