In February 2014, a collective was created under the name "Pas Question" in order to challenge the "Wathelet plan" which modifies certain air routes around Brussels-National airport. This group immediately mobilizes a diverse set of citizens around various modes of action (signing online petitions, filing complaints, sending letters to the authorities ...). A few months later, twelve defense associations for the victims of noise pollution linked to air traffic at the National airport created a common platform of four demands addressed to political decision-makers. This mobilization is not without success since in July 2014 a court orders the cessation of certain air routes provided for in the plan and that in April 2015the Michel government opts for the return to the old procedures. However, going back to old air routes also means moving nuisances to other populations. The challenge of this communication would be to question the success of this mobilization which combines online actions and offline action in return for the failure of potential counter-movements. It will be based on a study initiated by a Franco-Belgian team (co-directed by Jean-Gabriel Contamin, Jean-Marc Leblanc, Olivier Paye and Jean-Benoit Pilet) (ANR APPEL) devoted to e-petitioning, combining, on the one hand, an analysis of the data offered by the access to the petitions initiated on this question on the site lapetition.be (more than 20000 signatures on the main petition mostly accompanied by comments) and, on the other hand, an analysis of the other forms of mobilization initiated on this theme and the answers given by the public authorities. In particular, it will show the weight of social variables and areas of mobilization in the relative success of mobilizations against this infrastructure project.