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the FAA projects the growth of general aviation hours flown (FAA Aviation • Forecasts. FY 1989 to 2000). The local/itinerant operations split presented in Table II-11 (page 1 of 5) is based on FAA 5010 Form data for nontowered airports in the system. Data for the four towered airports were obtained from the FAA's Air Traffic Activity Report, FY 1984 to 1988. These data were supported by IVPIAS data. Projected local/itinerant percentages were based on the current distribution, as well as the role each airport is expected to play in the future. For example, general aviation activity at Minneapolis-St. Paul International can be expected to lessen as the commercial activity continues to dominate the airport. Piston aircraft, which are the primary aircraft conducting local operations, could-divert to reliever facilities to avoid the commercial traffic. If this diversion occurs, then the percentage of itinerant operations at Minneapolis-St. Paul International would increase significantly. This is shown in Table II-11 (pages 2 through 5). Conversely, airports s such as Airlake and Lake Elmo, where based aircraft aze comprised of more than 90 percent single-engine piston aircraft, can expect their percentages of local and itinerant operations to remain relatively stable. This has also been the case at similar airports in the United States. (2) Qperatianal Fleet Mix At airports that aze primarily general aviation airports, it is common for the based aircraft fleet mixes to be similaz to the operating fleet mixes. Such is the case with the seven relievers in this system. For airports where only piston aircraft are based, the operating fleet mix was assumed to be the same as the based aircraft fleet mix (see Table II 12). At the remaining airports, adjustments were made to reflect the fact that based turboprop and turbojet aircraft, as well as rotorcraft, do not often operate as frequently as the smaller aircraft. In addition, smaller aircraft are responsible for the vast majority of touch-and-go operations at all airports.. II-23