Opinion of the European Economic and Social Committee on ‘Amended proposal for a Regulation of the European Parliament and of the Council on the implementation of the Single European Sky (recast)’ (COM(2020) 579) and ‘Proposal for a Regulation of the European Parliament and of the Council amending Regulation (EU) 2018/1139 as regards the capacity of the European Union Aviation Safety Agency to act as Performance Review Body of the Single European Sky’ (COM(2020) 577)