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Therefore, at airports where turboprop and turbojet aircraft aze based, the operating fleet mix was adjusted to reflect a percentage of piston aircraft operations that is higher than the percentage of based piston aircraft. The estimating procedure previously mentioned has not proved to be a reliable technique in estimating operational general aviation fleet mixes at commercial service airports. At Minneapolis-St Paul International and other airline hub airports, the percentage ofsingle- and multiengine piston aircraft operations does not usually exceed the percentage of based piston aircraft. At Minneapolis-St. Paul International, the current based aircraft fleet mix was used as the current operating fleet mix. In the projection years, the percentage of single- and multiengine piston aircraft operations was gradually reduced to reflect the changing based fleet mix. The operating fleet mix for piston aircraft was not, however, reduced to zero. An assumption of zero operations by piston aircraft would not be reasonable. (3) Milita oer Military activity in this eight-airport system is generally restricted to St. Paul Downtown (11,496 in 1988), Minneapolis-St. Paul International (5,092 in 1988), and Flying Cloud Airport (1,173 in 1988). Crystal Airport experiences a small number of military operations, averaging 600 over the last five years. The remaining four airports experience 100 or fewer military operations annually. Projections of military activity aze not generally developed using the same procedures used to develop projections for civil activity. Military activity is a product of defense polity, and therefore does not grow as the mazket dictates. Increases in population or the buying power of a dollar, for instance, would undoubtedly have some effect on civil aviation. Military activity tends to remain at relatively constant levels. Based on this assumption, military activity in the system was estimated to remain constant throughout 2008 (see Table II-13). II-34