Judgment_paragraph 91 · Caisse de retraite du personnel navigant professionnel de l'aéronautique civile (CRPNPAC) v Vueling Airlines SA v Vueling Airlines SA and Jean-Luc Poignant (C-370/17, C-37/18)

91In the absence of EU legislation in this area, the rules for the implementation of the principle of the authority of res judicata are a matter for the domestic legal order of the Member States, in accordance with the principle that those States have procedural autonomy. Those rules must not, however, be less favourable than those governing similar domestic situations (the principle of equivalence) nor may they be framed in such a way as to make it in practice impossible or excessively difficult to exercise the rights conferred by the EU legal order (the principle of effectiveness) (judgment of 3 September 2009, Fallimento Olimpiclub, C‑2/08, EU:C:2009:506, paragraph 24 and the case-law cited).