Expedia is an online travel agency and is headquartered in the United States with offices in 31 countries. Book airline tickets, hotel, car rental, cruises, vacation packages and several amusement parks through the web and phone. The website uses multiple global distribution systems to make reservations such as the Saber system for booking flights and hotels, Worldspan, and Pegasus, in addition to its own reservation system for hotels belonging to its network of agreements.