Opinion of the Economic and Social Committee on: the ‘Proposal for a Regulation of the European Parliament and of the Council laying down the framework for the creation of the Single European Sky’, (COM(2001) 123 final); the ‘Proposal for a Regulation of the European Parliament and of the Council on the provision of air-navigation services in the Single European Sky’; the ‘Proposal for a Regulation of the European Parliament and of the Council on the organisation and use of the airspace in the Single Europe