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enhancing improvements at Anoka County-Blaine, the number of aircraft that require <br />diversion could be .reduced substantially. This option was considered in the <br />formulation of system alternatives. It is important to note that diversion between <br />an overburdened airport and a neighboring airport will occur only if the unburdened <br />facility has similaz facilities, such as instrumentation, fixed base operator (FBO) <br />services, and adequate rumvay length. <br />Two other reliever airports, St. Paul Downtown and Flying Cloud, will also <br />surpass 80 percent of operating capacity by the end of the planning period. These <br />two relievers will require diversion or capacity enhancements to avoid levels of delay <br />typically deemed as unacceptable. Formulation of reliever system alternatives also <br />considered possible demand diversion from these facilities to less congested reliever <br />system airports. Under a diversion scenario, Flying Cloud would need to divert nine <br />aircraft by the end of the planning period to avoid exceeding operational capacity. <br />St. Paul Downtown would need to divert approximately 55 based aircraft by the end <br />of the planning period to avoid 80 percent capacity saturation. Considering that the <br />location of St. Paul Downtown is relatively neaz the heart of a business district, it <br />is unlikely that corporate users would consider using as alternative system airport. <br />Therefore, it was assumed that diversion from St. Paul Downtown would consist of <br />tight single- and twin-engine aircraft, rather than the more demanding business <br />turboprop and jet aircraft. By the end of the planning period, St. Paul Downtown <br />is projected to have more than 140 single- and 29 multiengine-piston aircraft. These <br />less demanding, light aircraft aze the aircraft that would possibly divert to neighboring <br />airport facilities is the reliever system. <br />When as airport experiences operational demand levels that produce an <br />unacceptable level of delay (80 percent of ASV or greater), a suitable airport must <br />be available before diversion can occur. According to the results of a survey <br />conducted for. this study, the primary concern of general aviation users in selecting <br />an airport to base their aircraft is proximity to their place of business, home, etc. <br />Therefore, when formulating alternatives, it was assumed that an aircraft owner <br />N-9 <br />