People come and go, procedures are continually being changed, outside forces cause the firm to modify its structure and approach, etc. In that sense, an enterprise model is actually tougher to construct than a model to control a plane. On the other hand, the model of a plane had better be precisely accurate, otherwise the plane will crash. This last point brings to light the need to understand when and how an enterprise model should be used. Currently, enterprise models are aids to managers.
Managers still make the decisions and take actions.
Interestingly, the analogy between pilots and managers leads to another useful point. A pilot is usually considered sane, skilled, focused, conscious, and can be trusted to fly the plane properly and make judgments about the use of the plane's on-board systems and models. Suppose that a good enterprise model exists in an organization. I mention these questions because the rise in popularity of enterprise models offers both good and bad tidings for organizations. Information technologists that merely strive to build a good enterprise model must also take account the managers that will be called upon to use the models.