The Air Traffic System is composed of many superimposed complex flows structures following power-law distributions. We try to show that Air Traffic System flows such as airport and air traffic flows are bundles of refracted paths, which owe their global shape to the maximization of flow access, in accordance with the Constructal law. We investigate in parallel the development and evolution of Information Systems, which appear to follow the same underlying principle dictating the emergence of optimal airport architectures or street network geometries, with the apparition of typical tree shaped geometries, multiple scales architectures, self similarity, and power-law distribution in Information networks. The development in the last decades of approaches such as Emergent Design, Service Oriented Architecture, and sustainable management of Information System in general is then considered from the Constructal point of view.