ACRP Report 16 second edition is designed to help airport practitioners, owners, operators, managers, and policymakers of small airports, who may have varying degrees of experience and backgrounds, to fulfill their responsibilities in such areas as financial management, the oversight of contracts and leases, safety and security, noise impacts, community relations, compliance with federal and state obligations, facility maintenance, and capital improvements. The first edition has been edited and reformatted for currency, relevance, and usability and updated with additional information and new subject areas (e.g., unmanned aircraft systems, geographic information systems, digital notices to airmen, social media, and federal and state obligations). Also, hyperlinks to many of the documents and resources mentioned in this report, such as ACRP publications, industry sources and sample checklists, have been collected into ACRP WebResource 6: Resources for Managing Small Airports (crp.trb.org/acrpwebresource6).