Their airlines can arrange for baggage to be routed directly to the passenger's destination. Most major airports issue a secure keycard, an airside pass to employees, to assist in their reliable, standardized and efficient verification of identity. Facilities A terminal is a building with passenger facilities. Small airports have one terminal. Large ones often have multiple terminals, though some large airports, like Amsterdam Airport Schiphol, still have one terminal. The terminal has a series of gates, which provide passengers with access to the plane. The following facilities are essential for departing passengers: Check-in facilities, including a baggage drop-off Security clearance gates Passport control (for some international flights) Gates Waiting areas The following facilities are essential for arriving passengers: Passport control (international arrivals only) Baggage reclaim facilities, often in the form of a carousel Customs (international arrivals only) A landside meeting place For both sets of passengers, there must be a link between the passenger facilities and the aircraft, such as jet bridges or airstairs. There also needs to be a baggage handling system, to transport baggage from the baggage drop-off to departing planes, and from arriving planes to the baggage reclaim. The area where the aircraft parks to load passengers and baggage is known as an apron or ramp (or incorrectly, "the tarmac"). Airports with international flights have customs and immigration facilities. However, as some countries have agreements that allow travel between them without customs and immigrations, such facilities are not a definitive need for an international airport. International flights often require a higher level of physical security, although in recent years, many countries have adopted the same level of security for international and domestic travel. "Floating airports" are being designed which could be located out at sea and which would use designs such as pneumatic stabilized platform technology. Airport security Airport security normally requires baggage checks, metal screenings of individual persons, and rules against any object that could be used as a weapon. Since the September 11 attacks and the Real ID Act of 2005, airport security has dramatically increased and got tighter and stricter than ever before. Products and services Most major airports provide commercial outlets for products and services. Most of these companies, many of which are internationally known brands, are located within the departure areas. These include clothing boutiques and restaurants and in the US amounted to $4.2 billion in 2015. Prices charged for items sold