Judgment of the General Court (Sixth Chamber, Extended Composition) of 20 September 2019.#Havenbedrijf Antwerpen NV and Maatschappij van de Brugse Zeehaven NV v European Commission.#State aid – Corporate tax exemption scheme implemented by Belgium in favour of its ports – Decision declaring the aid scheme incompatible with the internal market – Concept of economic activity – Services of general economic interest – Non-economic activities – Separable nature – Selective nature – Request for a transitional period.#Case T-696/17.