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The projections of the based aircraft fleet mix were based on the current <br />fleet mix and changed slightly throughout the planning period. In FAA Aviation <br />Forecasts FY 1989 to 2000, the FAAprojects the national fleet mix to change in the <br />following manner between 1989 and 2000: <br />The percentage of single-engine piston aircraft will decrease gradually, <br />from 78.7 percent in 1989 to 73.3 percent in 2000. <br />Multiengine piston aircraft will decline in percentage through 1993, but <br />begin growing and hold a 10.6 percent share by 2000, down slightly <br />from the 10.8 percent share held in 1989. <br />The percentages of turboprop and turbojet aircraft will increase <br />significantly in the next it years; the turboprop share will grow from <br />2.4 percent in 1989 to 3.8 percent in 2000, while the turbojet share will <br />grow to 3.2 percent in 2000 from the current 2.0 percent. <br />Table II-7 (pages 2 through 5) depict the projected based aircraft fleet mix <br />for Minneapolis/St. Paul International and its seven relievers. As shown, the fleet <br />mixes change slightly over the 20-year period, accounting for the expected national <br />trends, aswell asairport-specific factors, such as geographic location. <br />3. AIRCRAFT' ACTIVITY PROJECTIONS <br />Annual activity data for the system airports were provided by MAC, as well as by <br />the respective airport managers. Operations totals or Minneapolis/St. Paul International, <br />,a~~ ~- Crystal, Flying Cloud, and Downtown St. Paul represent actual tower counts. The <br />remaining annual totals are estimates. Available historical annual operations data are <br />presented in Table II-8. <br />(1) Annual Operations <br />Annual general aviation operations at the reliever system airports were <br />projected using the operations per based aircraft (OPBA) methodology. In this <br />methodology, the projected number of based aircraft is multiplied by an appropriate <br />II-7 <br />