Over the years it is getting more present the use of machine learning techniques applied to many different disciplines. In aeronautic field they are used as a substitute or as an enrichment of flight systems in order to have a better production of flight data. The main three aspects studied in neural networks, which are one of the many machine learning techniques and the one used in this thesis, are the network architecture, the training phase and the testing phase.There are other very important aspects such as the various methods for carrying out these operations. The knowledge of the latter is very important in order to obtain very precise networks in the purpose that is set.