express and logistics activities. DHL changes its corporate colors from red and white to yellow and red. In April, the worldwide visual transformation of all vehicles, packing materials and buildings begins. 2004/2005 – Directly after the tsunami in South Asia, DHL, with over 40 offices throughout the disaster region, responds immediately to requests from government and aid organizations. The Group helps with free charter flights carrying relief supplies, land transport as well as monetary donations. DHL employees from around the world launch donation campaigns. DHL Disaster Response Teams (DRT) are established, supporting the UN and the international community's disaster response efforts in the aftermath of major sudden-onset natural disasters. 2005 – Deutsche Post World Net acquires Exel, a British logistics corporation, in December for 5.5 billion euros. 2007 – The DHL Innovation Center opens near Bonn. As a research and development center, its mission is to develop new, highly innovative and marketable products from the logistics trends of the future. Projects are realized via innovation partnerships within the business world and research partnerships. 2008 – DHL opens its new state-of-the-art European air hub at Leipzig/Halle Airport in Germany. The hub, one of Europe's largest construction sites, expands DHL's international network, providing greater connectivity to global growth markets and enabling DHL to improve its overall customer service. 2009 – The Group presents its Strategy 2015 and is renamed as Deutsche Post DHL. Headquarters DHL Supply Chain is incorporated in Bonn, Germany as a part of Deutsche Post DHL global headquarters. The main building is Post Tower. Located in the former government quarter and built using large quantities of glass, it is impressive because of its modern architecture. The tower is high, long and wide. Mergers and acquisitions The acquisition of the Swiss logistics provider Danzas and the largest American service provider in the field of international airfreight, Air Express International (AEI), by Deutsche Post, happened in 1999. Founded in 1815, the prestigious Danzas group was regarded as one of the world's leading logistics companies. With approximately 29,000 employees at the time of acquisition, Danzas had a strong logistics network on all continents. The acquisition of AEI was similar. AEI had a network of branches in 135 countries. In addition to integrated logistics and multi-modal transport, it was offering warehousing, distribution, customs processing and IT-based logistics services. AEI was integrated into the Intercontinental division of Danzas. As a full-service provider, the merged