A global distribution system (GDS) is a computerized network system owned or operated by a company that enables transactions between travel industry service providers, mainly airlines, hotels, car rental companies, and travel agencies. The GDS mainly uses real-time inventory (e.g. number of hotel rooms available, number of flight seats available, or number of cars available) to service providers. Travel agencies traditionally relied on GDS for services, products, and rates in order to provide travel-related services to the end consumers. Thus, a GDS can link services, rates, and bookings consolidating products and services across all three travel sectors: i.e., airline reservations, hotel reservations, car rentals.