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Total operating cost is probably the major measure of effectiveness of aircraft. Fuel usage is also very important but shows up in cost also. Another vital design factor today is community acceptability. Community acceptability primarily concerns noise and air pollution, visible and invisible. In addition, there are the requirements of the airport community itself, namely runway length, runway strength, ramp parking areas, loading docks, etc. , the wheel loading on the runway, is a vital consideration in landing gear design as is the radius of turn.

A delay of 15 minutes in baggage retrieval can produce a substantial reduction in effective overall speed, about 10% or 40 knots on a 1000 mile flight. All of these things could make a passenger prefer one airplane to another. Usually all airplanes of a given generation are about equal in order to remain competitive, unless a slightly later design is able to introduce and innovation which the earlier airplane cannot duplicate because of the cost of changing tooling. An overriding requirement in all airplanes is safety.

Deregulation of the industry was followed quickly by new entrants, lower fares and the opening of new routes and services to scores of cities. The growth in air traffic brought on by deregulation's first two years ended in 1981 when the country's professional air traffic controllers went on strike. Traffic surged again after 1981, adding 20 million new passengers a year in the post strike period, reaching a record 466 million passengers in 1990. In 1989 events began which severely damaged the economic foundations of the industry.

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Aircraft Design Synthesis and Analysis Desktop Aeronautics by Kroo, Ilan & Shevel, Richard

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