A method and apparatus for processing routes is disclosed. An area of interest associated with a number of routes for a number of aircraft and an identification of a number of weightings for a number of characteristics for the number of routes are identified. The number of characteristics includes at least one of a number of environmental characteristics or a number of economic characteristics. A number of new routes are generated based on information about the number of routes associated with the area of interest. Values are identified for characteristics in the number of characteristics for each new route in the number of new routes and for each route in the number of routes based on the information. A performance value is identified for the each new route and for the each route based on the values and the number of weightings for the number of characteristics.
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