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facility improvements maybe required to encourage system diversion from overutilized to underutilized airports. 2. Operational Demand With Alternative 2, Anoka County-Blaine will still exceed 100 percent of its operational capacity by the end of the planning period (129 percent) because a suitable airport is not available to accommodate all potential diversion. St Paul Downtown, with the diversion of 55 based aircraft to Lake Elmo, will operate at approximately 80 percent of its operational capacity by 2008. Crystal Airport will surpass 75 percent of its operational capacity by 2008. The reliever system as a whole will be operating at almost 74 percent of capacity. The number of total operations projected for each reliever airport, after diversion occurs, is presented in Table N 5. This table also provides a comparison of the number of operations at each airport to estimated ASV. 3. System Delay With Alternative 2, total delay experienced by the reliever system will surpass SS million minutes annually by the end of the planning period. This level of system delay is equal to almost four minutes of average delay for each aircraft operation. As with all development alternatives, average delay per operation varies widely from reliever to reliever. At Anoka County-Blaine, average annual delay per aircraft operation is approximately 15 minutes. By diverting 55 based aircraft and their associated operations from St Paui Downtown, the average delay per aircraft operation is reduced from 2.8 minutes in Alternative 1(no diversion) to 1.2 minutes in Alternative 2. Both Crystal and Flying Cloud airports are also expected to experience an average annual delay of 1.2 minutes per operation as they approach 80 percent of their operational capaaty in Alternative 2. While diversion of activity to Lake Elmo will increase its average delay slightly, the reduction in delay at St. Paul Downtown more than offsets this modest increase. 4. Preliminary System Cost As with Alternative 1, Alternative 2 does not include additional rumvays to increase system capacity or the addition of new airports to the reliever system. Before diversion between St Paul Downtown and Lake Elmo can be realized, however, airside improvements will be required at Lake Elmo. The 1976 master plan study for Lake Elmo recommended parallel runways for both the existing primary and crosswind runway. ' While it is doubtful that the operational demand at this airport will wamdnt parallel rumvays, the master ' Master Plan Study, Lake Elmo Airport, September 1976, R Dixon Speas Associates. N-22