Liège has also been an important centre for gunsmithing since the Middle ages and the arms industry is still strong with the headquarters of FN Herstal. The economy of the region is now diversified, the most important centers are mechanical industries (aircraft engine and Spacecraft propulsion), space technology, information technology, biotechnology and also production of water, beer or chocolate. Liège Science Park south east of the city, near the University of Liège campus, houses spin-offs and high technology businesses. Liège is also a very important logistic center: the city possesses the third largest river port in Europe, directly connected to Antwerp, Rotterdam and Germany via the Meuse river and the Albert Canal. In 2006 Liège Airport was the 8th most important cargo airport in Europe. A new passenger terminal was opened in 2005. It is also the main hub and the headquarters of TNT Airways.