A terminal is a structure that houses passenger facilities. Small airports often have only one terminal. Large airports frequently feature many terminals, however others, such as Amsterdam Airport Schiphol, only have one. The terminal contains a number of gates that allow passengers to board the plane. Each gate is staffed by at least one check-in agent who assists passengers in checking in luggage and completing other paperwork before boarding. Amsterdam Airport has two terminals: T1 and T2. T1 opened in 1971 and was designed by IJSBP (now RDP Architecten). T2 opened in 1995 and was also designed by RDP Architecten. Both terminals are fully air-conditioned with self-check-in kiosks and security screening stations. Travelers can purchase food and beverages, book tours, and use the ATM machine at either terminal. There is no need to change terminals to visit most destinations from Amsterdam; just pick up a map at the information desk and find your way around. The airport serves about 55 million passengers a year and is one of the largest in Europe. It is owned by KLM and its partner airlines including Air France, Alitalia, Austrian Airlines, Brussels Airlines, Delta, EgyptAir, Lufthansa, Oman Air, Qatar Airways, Saudi Arabian Airlines, Singapore Airlines, Swiss International Air Lines, Turkish Airlines, and United Arab Emirates Airlines.