Global business and tourism depend heavily on the efficient operation of airports and movement of passengers, baggage, and cargo across many areas. With increasing demand and connectivity requirements for airports comes the need for more sophisticated simulation and modeling tools to validate design assumptions. Furthermore, airport design and planning decisions have significant impacts on policy and major capital improvement decisions, which can be supported by simulation and modeling tools at many levels. ACRP Synthesis 98: Simulation Options for Airport Planning is the result of the collection and analysis of information on current industry practices and on applications of simulation tools for airport planning and design. Credible simulation projects can help airport administrators, designers, engineers, and planners estimate the impact of planned changes on passenger traffic, aircraft traffic, roadway traffic, baggage movements, and other subsystems such as bus and train links and aircraft ground support operations. The toolsets and processes used to analyze and simulate airport operations have changed significantly since the 1980s, when analysis techniques were limited to general purpose queuing and network analysis concepts or purpose-built simulation tools. These tools have become much more sophisticated and accurate in emulating real-world aircraft, passenger, and vehicle dynamics.