A method and apparatus for comparing aircraft parts. A first model is identified for a first aircraft with first customer options. A second model is identified for a second aircraft with second customer options. First parts for the first aircraft in the first model are compared with second parts for the second aircraft in the second model. Graphical representations of the first parts in a first location and the second parts in a second location are displayed simultaneously on a display system. The second location in the second aircraft corresponds to the first location in the first aircraft. Differences between the parts in corresponding locations in the first aircraft and the second aircraft are visually displayed.