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4 Table 2. Active U.S. fleet in 2006. Aircraft Type Primary Use Piston Turboprop Jet Other Total GA (Part 91) Personal / Business / Corporate 141,476 5,183 7,581 30,253 184,493 Other 19,251 1,457 309 7,350 28,367 On-Demand (Part 135) Air Taxi 2,659 1,272 2,426 1,282 7,639 Other 356 152 63 1,143 1,714 Total 163,742 8,064 10,379 40,028 222,213 Geographic Coverage Table 3. Estimated average hours flown in 2006. The forecast is limited to fleets covering aircraft activity in Aircraft Type Piston Turboprop Jet the lower 48 states. In addition, only public-use airports are 101 268 393 considered. To further limit the number of airports that must be analyzed, only those airports with jet fuel availability and at least one 3,000-ft lighted runway are included. While this sis of small next-generation aircraft focuses on potential addi- potentially excludes some small airports that could accom- tions to the shaded areas in Table 2 from small next-generation modate modern piston aircraft such as the Cirrus SR-22, it aircraft. includes the most heavily used airports that make up about It is difficult to assess activity in terms of hours flown by 85% of total GA operations across the United States. use category because many aircraft are used in different cate- gories at different times. The FAA has published average activity estimates by aircraft type, as shown in Table 3. In gen- Review of Existing GA eral, it is expected that financial considerations would cause and Air Taxi Markets the air taxi category to exhibit higher than average utilization According to FAA data for 2006, the current active U.S. rates across all aircraft types. fleet certified for GA use under Part 91 or On-Demand use The forecasting effort undertaken here treats the private/ under Part 135 totals about 222,000 aircraft. A breakout by corporate/fractional market and the charter/air taxi market primary use and aircraft type is shown in Table 2. This analy- separately, and two separate forecasts have been produced.