AIX is a modern unix operating system. Its shortcomings and advantages all stem from the fact that most of it's features were developed by the same developers and thus are tightly related. It has contributed much to the modern operating system, giving us the journaling file system, the logical volume, and many other features we consider to be part of a modern unix. In this lecture, we go over these features, consider their advantages and disadvantages, and how many of them relate to linux and open source.