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The remaining methodologies -per capita ownership and market shaze -- produce <br />reasonable projections (see Table II-2 and Table II-3). The preferred projection for this <br />analysis was a combination of the two acceptable methodologies. The arithmetic mean of <br />the two projections was used, thereby accounting for the effect of national trends (mazket <br />share) and regional growth (per capita ownership). Registered aircraft projections for the <br />Twin Cities metropolitan azea are as follows: <br /> Metropolitan Area <br />yg~ ~pgtered A±*cra~* <br />1993 2,811 <br />1998 2,915 <br />2003 3,029 <br />2008 3,146 <br />• 2. BASFn eiR(~RAFT PRO~CTIONS <br />The number of based aircraft at Minneapolis-St. Paul International Airport and its <br />seven reliever airports, as well as the based aircraft fleet mixes, was projected through 2008 <br />to determine the future aircraft levels to be accommodated by the reliever system in an <br />unconstrained demand scenario. <br />(1) Based Aircraft <br />The number of based aircraft at the reliever system airports was projected <br />using a market share approach. The registered aircraft projections (see preceding <br />section) were used in conjunction with historical based aircraft figures to determine <br />the shaze of general aviation registrants is the metropolitan azea held by <br />Minneapolis-St. Paul International and its seven relievers. This market shaze was <br />projected through the planning period to determine the total number of system based <br />II-8 <br />