ACRP Report 38: Understanding Airspace, Objects, and Their Effects on Airports provides a comprehensive description of the regulations, standards, evaluation criteria, and processes designed to protect the airspace surrounding airports. Aviation practitioners, local planning and zoning agencies, and developers all have a need to understand and apply the appropriate airspace design and evaluation criteria to ensure a safe operating environment for aircraft, to maintain airport operational flexibility and reliability, without unduly restricting desirable building development and attendant economic growth in the surrounding community.