The main objective of this Project is the optimal fleet study selection of a new low cost company. This Project firstly consists on the research of documentation concerning air traffic statistics. Subsequently the compiled statistics documentation is cross-documented for a further route selection study. The aim is to specify and characterise the air traffic studied to find our airline routes. Thanks to the stated processes it is then possible to find the final route selection. We will proceed with the route cost calculation which will be the result obtained of a broad number of calculation processes. The last part of the memory describes the optimal fleet and route values, where we will characterise our low cost company making sure that the results obtained are suitable according to the standards of the Project. The contents of this Project are purely explanative. It describes the established guidelines, the marked objectives, and the difficulties that appeared throughout the entire Project, the techniques to abroad the problems and the results obtained.