The proposed expansion of the Josep Tarradellas Barcelona-El Prat Airport once again endangers one of Catalonia's most fragile and valuable natural areas: the Llobregat Delta. Given the announcement made this week by AENA and the Generalitat (Catalan government), it is necessary to firmly oppose any project that would further impact this environment, especially while Spain is facing an infringement procedure with the European Commission (case EU-Pilot 5866/13/ENVI) for the poor management of this area.