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aircraft based at system airports will increase from 2,030 in 1988 to 2,438 by <br />2008. Table 1I-6 reflects specific based aircraft assignments by airport. <br /> <br />4. OPERATIONS <br /> <br />Operations were projected using an operations per based aircraft (OPBA) <br />approach and historic data on annual system operations. Operations at <br />reliever system airports are expected to grow from 877,472 in 1988 to <br />1,369,771 by 2008~ <br /> <br />5. OTHER PROJECTIONS <br /> <br />For the system as a whole, operations will be fairly evenly distributed between <br />local and transient operations. The based and operational fleet mixes are <br />expected to exhibit decreasing percentages of single and multiengine-piston <br />aircraft. Turboprop and turbojet aircraft will constitute an increasing <br />percentage of the fleet. <br /> <br />6. FORECAST COMPARISON <br /> <br />The overall average annual rate of growth reflected in the reliever system <br />operations forecasts is equal to that used in the FAA's recent hub forecast for <br />the reliever airports. Table 11-14 provides a projection comparison and Table <br />I1-15 a forecast summary. <br /> <br />-8- <br /> <br /> <br />