TRB's Airport Cooperative Research Program (ACRP) Synthesis 81: Food and Beverage and Retail Operators: The Costs of Doing Business at Airports explores ways to comprehend the complex airport terminal operating environment in order to understand and forecast operating costs and to judge the potential for success and profitability. The synthesis compiles practices of airports to improve the communication of cost data to better evaluate and make decisions based on the total cost of doing business at airports.