Building Information Modeling (BIM) can significantly impact both new as well as existing architecture/engineering/construction (AEC) projects. It can provide a virtually simulated and large integrated database that can be leveraged not only in design and engineering, but also in planning and management operations, and facilities maintenance. Although most of the BIM tools are now mature enough to use in various phases of project lifecycle, they have been primitive and under-developed for many years. The concepts underpinning BIM have been around since the 1960s through various manufacturing industries such as automotive, ship building or aerospace. In the aerospace industry, especially in aircraft design and manufacturing, the concept similar to BIM is a Digital Mock-Up (DMU). It is both a tool and a product of engineering. As in BIM, aircraft’s DMU is also a comprehensive digital product representation that is used to simulate the use, behavior and performance of a finished aircraft. While BIM and DMU are used for different industries and products, they do share similarities and differences. This paper briefly describes BIM and DMU technologies and their context, specifically focusing on implementation of these two technologies for operation and maintenance (O&M).