A system for supporting maintenance of an aircraft is provided. The system includes a plurality of database importers. The database importers import a plurality of datasets from a plurality of data sources to a database with a composite dataset including data of the plurality of datasets. The system also includes a database-management system (DBMS) to manage the database. The system further includes a client application coupled to the DBMS. The client application receives a user request for a demand for replacement aircraft parts for maintenance during an in-service lifecycle of the aircraft. In response to the user request, the client application predicts and thereby produces a prediction of the demand based on the data retrieved from the composite dataset.