Whether an airport facility should be expanded or not depends upon two major factors: One relates to how fast enplaned passengers of the airport increase over time, and the other, to when the present airport capacity is judged no longer adequate to provide decent services to the increasing number of passengers. This paper deals with the first problem by presenting a forecasting model of enplaned passengers at the Mobile Municipal Airport, which in fact is a summary of our work involved in reconciling high forecasts made by a local consulting firm upon request from the city officials who advocate the expansion and low forecasts made by the airline companies serving Mobile which will have to pay for the expansion if one is agreed upon.