SSP Group plc opens state-of-the-art conference centre in Düsseldorf Airport   London, 2017-May-15 — /EPR Retail News/ — SSP Group plc, a leading operator of food and beverage outlets in travel locations worldwide, has partnered with Düsseldorf Airport to open a state-of-the-art conference centre in the heart of the airport. The new conference centre DUSconference plus was officially opened…