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the commercial traffic. If this diversion occurs, then the percentage of itinerant <br />operations at Minneapolis/St. Paul would increase significantly. This is shown in <br />Table II-11 (pages 2 through 5). Conversely, airports such as Airlake and Lake <br />Elmo, whose based aircraft are comprised of more than 90 percent single-engine <br />piston aircraft, can expect their percentages of local and itinerant operations to <br />remain relatively stable. This has also been the case at similaz airports in the United <br />States. <br />(2) Q,perational Fleet Mix <br />At airports that are primarily general aviation airports, it is common for the <br />based aircraft fleet mixes to be similar to the operating fleet mixes. Such is the case <br />with the seven relievers in this system. For airports where only piston aircraft aze <br />based, the operating fleet mix was assumed to be the same as the based aircraft fleet <br />mix (see Table II-12). At the remaining airports, adjustments were made to reflect <br />the fact that based turboprop and turbojet aircraft, as well as rotorcraft, often do not <br />operate as frequently as the smaller aircraft. In addition, smaller aircraft aze <br />responsible for the vast majority of touch and go operations at all airports. <br />Therefore, at airports where turboprop and turbojet aircraft are based, the operating <br />fleet mix was adjusted to reflect a percentage of piston aircraft operations that is <br />higher than the percentage of based piston aircraft. <br />The estimating procedure mentioned above has not proved to be a reliable <br />technique in estimating operational GA fleet mixes at commercial service airports. <br />At Minneapolis/St. Paul International, and other airline hub airports, the percentage <br />of single- and multiengine piston aircraft operations does not usually exceed the <br />percentage of based piston aircraft. At Mianeapolis/St. Paul, the current based <br />aircraft fleet mix was used as the current operating fleet mix. In the projection years, <br />the percentage of single- and multiengine piston aircraft operations was gradually <br />reduced to reflect the changing based fleet mix. The operating fleet mix for piston <br />II-9 <br />