13. Commission Notice: Interpretative guidelines on Regulation (EC) No. 1008/2008 of the European Parliament and of the Council - Public Service Obligations (PSO) (2017/C 194/01) - European Air Law (Update) View the chapter 13. Commission Notice: Interpretative guidelines on Regulation (EC) No. 1008/2008 of the European Parliament and of the Council - Public Service Obligations (PSO) (2017/C 194/01) by - European Air Law (Update) 13. Commission Notice: Interpretative guidelines on Regulation (EC) No. 1008/2008 of the European Parliament and of the Council - Public Service Obligations (PSO) (2017/C 194/01)