Case C-379/09: Judgment of the Court (Third Chamber) of 10 March 2011 (reference for a preliminary ruling from the Arbeidshof te Brussel (Belgium)) — Maurits Casteels v British Airways plc (Freedom of movement for workers — Articles 45 TFEU and 48 TFEU — Social security for migrant workers — Protection of supplementary pension rights — Inaction on the part of the Council — Worker employed successively by the same employer in several Member States)