Abstract: A computer implemented method, apparatus, and computer program product for performing flight planning to reduce an effect of emissions. A method is present for performing flight planning. A set of emissions data is identified for an aircraft for a plurality of route segments in a route as a function of parameters for the aircraft including the route, a weight, an altitude, and engine data. A flight plan is generated for the aircraft based on a total of each type of emission in the set of emissions data from the plurality of route segments. A portion of the parameters for the aircraft is modified to reduce the effect of the emissions and meet a set of objects for the flight plan until the flight plan meets an objective.