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delay averages 2.8 minutes per aircraft. The actual delay at any given time depends on a number of conditions and can vary by a factor of five or more. Based on these capacity/delay ratios, only one reliever airport is currently experiencing an average level of delay greater than one minute (see Table III 3). Currently, Anoka County-Blaine is experiencing an average level of delay between 1.6 and 1.8 minutes per operation By the end of the planning period, Anoka County-Blaine, St. Paul Downtown, and Flying Cloud airports will experience average aircraft delays greater than one minute. Crystal Airport will also approach aone- minute delay by We end of the planning period under the base case scenario. Table III-3 provides estimates of total annual delay at each reliever. Currently, the reliever system is experiencing more than 600,000 minutes of delay by operating aircraft. Approximately 57 percent of this delay is occurring at Anoka County-Blaine Airport. Anoka County-Blaine has the greatest number of operations and the highest average annual aircraft delay. Only one airport, St Paul Downtown, will be noticeably affected by the 28,000 general aviation operations that could be diverted from Minneapolis-St. Paul International. An increase in the ratio of annual demand to ASV from approximately 93 percent (base case) to 99 percent (base + diversion) can add more than a minute to the average annual delay per aircraft at St Paul Downtown, with the average delay per aircraft increasing from 1.8 minutes to 2.8 minutes By 2008, total annual delay throughout the reliever system will increase to more than 5,770,000 minutes. By the end of the planning period, more Wan 80 percent of all delay will be attributable to Anoka County-Blaine; however, delay at each airport will also increase. III-i i