Posting of workers: when the ideal of cooperation between national institutions prevails over the fight against fraud: Joined Cases C-370/17 and C-37/18, Caisse de retraite du personnel navigant professionnel de l 'aeronautique civile (CRPNPAC) (C-370117), Vueling Airlines SA (C-37/18), Judgment of the Court of Justice (Grand Chamber) of 2 April 2020, EU:C:2020:260
