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(2) Based Aircraft Fleet Mix <br />The airports' existing fleet mixes were developed using data from Volume 1 <br />of the current Minnesota State Aviation System Plan and FAA Form SO10.' These <br />data were further supported by data from the National Plan of Integrated Airport <br />Systems (NPIAS). The current based aircraft fleet mix for Minneapolis-St. Paul <br />International and the reliever airports is shown in Table II-7 (page 1 of S). <br />Based aircraft fleet mix projections, based on the current fleet mix, changed <br />slightly throughout the planning period. In EAA Aviation Forecasts. FY 1989 to <br />~~, the FAA projects the national fleet mix to change in the following manner <br />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 />will 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 11 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 S) depicts 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 expected national trends <br />as well as airport-specific factors such as geographic location. <br />' Volume 1, Minnesota State Aviation System Plan; Howard, Needles, Tammea, and <br />Bergendoff; January 1989. <br />II-13 <br />