Nowadays global distribution systems interconnect almost everything within the hospitality industry, from hotels to car rental companies and travel agencies. There are four major GDS available: Amadeus, Galileo, Sabre and WorldSpan. Some of the advantages provided by GDS are their availability (99,9% of the time), their response times (up to a fraction of a second), their multiple booking capability, as well as their top of the line architecture. On any given day, a GDS will be capable of accessing over 50000 hotels and approximately 1000 airlines. Through GDS systems, people are able to book various hotel rooms, tours, airline seats, cruises and even limousines.