Mega infrastructure projects require building broad social and political support. This effort calls for an effective and proactive communications strategy. In fact, a common weakness in many projects is the lack of a coherent communications strategy linking the needs, expectations, and concerns of the project’s stakeholders. Until November 2015, the New International Airport of Mexico City (Nuevo Aeropuerto Internacional de la Ciudad de México, NAICM) had not developed such a strategy, nor the Airport Group of Mexico City (Grupo Aeroportuario de la Ciudad de México, GACM) had established a communications office with the mandates of building consensus and enabling more inclusive decision making. This chapter will describe the communications efforts carried out in relation to NAICM and how they can be improved to abide by international good practices.