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3. System Delay Total reliever system delay for Alternative 7 is estimated to be 1.4 million minutes annually by the end of the planning period. The average delay per aircraft operation is estimated at one minute by the end of the planning period. Four airports, Anoka County-Blaine, Crystal, Flying Cloud, and St. Paul Downtown, will experience 1.2 minutes of average delay per aircraft. Other relievers will experience less than .7 minutes of delay per operation by the end of the planning period (see Table N-10). 4. Preliminary System Cost The rnst of Alternative 7 is a combination of development costs from Alternatives 4 and 5. This cost includes improvements at Gateway North Industrial, Anoka County-Blaine, and Lake Elmo. The total development rnst for Alternative 7 is estimated at S11,888,000. (8) Alternative 8 is a combination of system improvements recommended in Alternatives 4 and 6. These improvements include construction of a new airport in Search Area "A", implementation of a parallel runway and air traffic control tower at Anoka County-Blaine, and a rumvay extension at Lake Elmo to aid in attracting diversion from St. Paul Downtown. Diversion of aircraft from St. Paul Downtown is important because capacity enhancement for this facility is unlikely. Without diversion, demand at St. Paul Downtown will approach 100 percent of operational capacity by the end of the planning period. Fslubit N 11 illustrates the development recommended in Alternative 8. 1. System Diversion A new general aviation airport in Search Area "A" would consist of a single runway and a parallel taxiway. This configuration would have an associated ASV of approximately 230,000 annual operations. The OPBA for the new airport is estimated at 625, which is based on the average OPBA for surrounding reliever airports. With an OPBA of 625, 294 based aircraft could be accommodated at the new airport in 2008. Anoka County-Blaine's N-43