This web-only guidebook is intended to provide a comprehensive summary of all the requirements included in the 39 grant assurances applicable to airport sponsors (owners or operators of the airport that execute the AIP grant agreements containing the grant assurances). The guidebook describes the requirements, identifies the actions that are required and those that are prohibited, identifies exceptions, describes the duration and applicability of the requirements, and discusses the potential consequences of non-compliance. The technical appendices in Volume 2 of this guidebook are intended to provide supplemental information that may assist airport staff and other stakeholders in understanding which grant assurances apply to a particular situation and what is required to achieve or maintain compliance.