The best GSA for all companies in the Travel and Hospitality Industry! ITSC stands for International Travel Support Center and is a well-known Global Sales Agency (GSA) in the European Travel Industry. ITSC has presence in the Netherlands, Belgium, Luxembourg, Germany, Switzerland, and the UK. With a team of strong sales professionals, ITSC represents high quality companies including Marriott Hotels International and Hertz Rent A Car. The focus of ITSC’s associates is to provide account management, to increase our clients’ preference, to grow loyalty and revenue. All account managers have a strong knowledge about the travel industry and intermediary market and have a wide sales network. Choosing for ITSC means choosing for commitment, dedication and revenue streams.