Modeling and Simulation - M&S is recently gaining more importance and emphasis as an essential method for developing engineering systems especially for aerospace and automotive systems, due to their complexity, integration and even human involvement. The main reasons for M&S having that important role nowadays are: 1) M&S can predict system behavior and possible problems. Therefore, it can reduce time and cost for developing systems, it can avoid future corrections into systems, as well. 2) M&S can be used for conception, training, maintenance, etc., requiring less expensive tools and previously preparing people to the real scenario. 3) When it comes to situations that involve aerospace or other products, where high costs are involved, mistakes can be avoided or at least minimized. Summarizing, M&S can reduce project cost and schedule, and improve quality. In this work we develop a discussion and demonstration of some characteristics of an advanced HLA/RTI environment for aerospace applications. To do that we first review the related concepts and literature, the techniques and tools presented there. Then we select one environment for discussion and demonstration together with a case study representative of that area. We also reference some useful remarks about our first experience in installing and running the selected environment, as a roadmap for new users. In addition to a discussion about M&S, this work also presents some data regarding standardized M&S architectures. This is done by the use of HLA 1516 standard definitions and tools herein used. Standardized M&S architectures are advantageous for simulation, as they can connect simulators and enable their reuse.