OASIS is a set of tools designed to collect and share the following aviation data related to aircraft and air operators: Aircraft Registration System (ARS), Air Operator Certificates (AOCs), Aircraft Type Designators (Doc 8643), and Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services (Doc 8585). It provides a one-stop access to safety data related to aircraft and operators, allowing the ability to enter, validate and modify the data at source