Managers of airports of all sizes face a perennial dilemma: how to efficiently train operations personnel to meet Title 14 Code of Federal Regulations Part 139 requirements and ensure a safe and secure airport environment. The TRB Airport Cooperative Research Program's ACRP Synthesis 112: Airport Operations Training at Small Airports focuses on airport operations employees and aims to better understand current training methods and programs in use by small airports in the United States (including nonhub, nonprimary commercial service, reliever, and general aviation) to initially and recurrently train airport operations employees.