Within the terminal, passengers purchase tickets, transfer their luggage, and go through security. The buildings that provide access to the airplanes (via gates) are typically called concourses. However, the terms "terminal" and "concourse" are sometimes used interchangeably, depending on the configuration of the airport.
Smaller airports have one terminal while larger airports have several terminals and/or concourses. At small airports, the single terminal building typically serves all of the functions of a terminal and a concourse.
Some larger airports have one terminal that is connected to multiple concourses via walkways, sky-bridges, or underground tunnels (such as Denver International Airport). Some larger airports have more than one terminal, each with one or more concourses (such as New York's JFK Airport). Still other larger airports have multiple terminals each of which incorporate the functions of a concourse (such as Dallas/Fort Worth International Airport).
According to Frommers, most airport terminals are built in a plain style, with the 'concrete boxes of the 1960s and '70s generally gave way to glass boxes in the '90s and '00s, with the best terminals making a vague stab at incorporating ideas of "light" and "air"'. However, some, such as Baghdad International Airport, are monumental in stature, while others are considered architectural masterpieces, such as Terminal 1 at Charles de Gaulle Airport near Paris or Terminal 5 at New York's JFK Airport. A few are designed to reflect the culture of a particular area, some examples being the terminal at Albuquerque International Sunport in New Mexico, which is designed in the Pueblo Revival style popularized by architect John Gaw Meem, as well as the terminal at Bahías de Huatulco International Airport in Huatulco, Oaxaca, Mexico, which features some palapas that are interconnected to form the airport terminal.
Due to the rapid rise in popularity of passenger flight, many early terminals were built in the 1930s–1940s and reflected the popular art deco style architecture of the time. One such surviving example from 1940 is the Houston Municipal Airport Terminal. Early airport terminals opened directly onto the tarmac: passengers would walk or take a bus to their aircraft. This design is still common among smaller airports, and even many larger airports have "bus gates" to accommodate aircraft beyond the main terminal.
A pier design uses a small, narrow building with aircraft parked on both sides. One end connects to a ticketing and baggage claim area. Piers offer high aircraft capacity and simplicity of design, but often result in a long distance from the check-in counter to the gate (up to half a mile in the cases of Kansai International Airport or Lisbon Portela Airport's Terminal 1). Most large international airports have piers, including Chicago's O'Hare International Airport, Larnaca International Airport, Frankfurt International Airport, London Heathrow Airport, Amsterdam Schiphol Airport, Murtala Muhammed International Airport, Kuala Lumpur International Airport, Mérida International Airport, Bangkok International Airport, Mazatlan International Airport, Beirut International Airport, Hong Kong International Airport, Allama Iqbal International Airport, Tijuana International Airport, Rome Fiumicino Airport, Toronto-Pearson International Airport, Delhi International Airport, Fort Lauderdale–Hollywood International Airport, Mumbai International Airport, and Miami International Airport.
A satellite terminal is a building detached from other airport buildings, so that aircraft can park around its entire circumference. The first airport to use a satellite terminal was London Gatwick Airport. It used an underground pedestrian tunnel to connect the satellite to the main terminal. This was also the first setup at Los Angeles International Airport, but it has since been converted to a pier layout. The first airport to use an automatic people mover to connect the main terminal with a satellite was Tampa International Airport, which is the standard today. Other examples include the following:
- Paris's Charles de Gaulle Airport (Terminal 1), Geneva International Airport and London Gatwick Airport (South Terminal) have circular satellite terminals, connected by walkways.
- Lisbon Internacional Airport (Terminal 2) has a small rectangular satellite terminal, connect by a free shuttle service (accessible by Terminal 1, every 10 minutes).
- Orlando International Airport and Pittsburgh International Airport have multi-pier satellite terminals.
- Brussels Airport's Pier A is connected to the main building via underground tunnels and walkways.
- Zurich Airport's Midfield Terminal (Concourse E) is connected to the main terminal via an underground Skymetro.
- At Logan International Airport in Boston, Terminal A has two sections of gates, one of which is a satellite terminal connected by an underground walkway.
- Denver International Airport, Cincinnati/Northern Kentucky International Airport, and Hartsfield-Jackson Atlanta International Airport have linear satellite terminals connected by central passages. The linear satellite terminals are also connected by automatic people movers.
- At O'Hare International Airport, Terminal 1 comprises Concourses B and C. Concourse B is adjacent to the airport road and houses United Airlines passenger check-in, baggage claim and security screening landside and aircraft gates on the airside, while Concourse C is a satellite building connected by an underground walkway lit with a neon light show, and an airy and very slow-tempo version of the United theme music "Rhapsody in Blue".
- London Stansted Airport has one main terminal building with three linear satellite terminals all connected to the main terminal by an automated people mover. The airport is currently expanding by adding another satellite building.
- Kuala Lumpur International Airport has a cross-shaped satellite terminal which is used for international flights.
- Cancun International Airport Terminal 2 is an irregular terminal with two concourses, Main building and Satellite building, the latter one being the satellite terminal.
- In George Bush International Airport, Terminal C consists of the North Concourse and the South Concourse, connected by the central building where United Airlines which houses passenger check in, baggage claim and ground transportation. Terminals A and B consist of a similar design.
- Seattle-Tacoma International Airport has two rectangular satellite terminals connected by automatic people movers.
- Jinnah International Airport in Karachi has one main terminal, divided into two concourses: the Jinnah East Satellite Concourse, used for international flights, and the Jinnah West Satellite Concourse, used for domestic and some international flights.
- McCarran International Airport in Las Vegas has an X-shaped satellite terminal, named Concourse D, that is connected by two automatic people movers - one from Terminal 1 (which houses Concourses A, B, and C) and one from Terminal 3 (which houses Concourse E). In addition, despite being part of Terminal 1, Concourse C is connected to the rest of the terminal by an automatic people mover.
- Mariano Escobedo International Airport is the first and only airport in Mexico which has a completely satellite terminal. Terminal A is connected from Main to Satellite building via underground tunnels.
- Terminal 5 at London Heathrow Airport has two satellite terminals, 5B, and 5C, connected via an underground people mover.
- Abu Dhabi International Airport
- Rome Fiumicino Airport has one satellite terminal, called T3G, connected by a Bombardier Innovia APM 100.
- Madrid–Barajas Airport has one linear satellite terminal, named T4S, which is connected to the Terminal 4 main building by an automated people mover.
- Both midfield terminals at Washington Dulles International Airport use this design, with Concourses A, B, and C being connected to the main terminal by the AeroTrain, and Concourse D via a mobile lounge service. There is also an underground walkway from the main terminal to Concourse B.
Some airports use a semicircular terminal, with aircraft parked on one side and cars on the other. This design results in long walks for connecting passengers, but greatly reduces travel times between check-in and the aircraft. Airports designed around this model include Charles de Gaulle Airport (terminal 2), Chhatrapati Shivaji International Airport, Mumbai (terminal 2), Dallas/Fort Worth International Airport, Seoul's Incheon International Airport, Jakarta's Soekarno-Hatta International Airport, Toronto Pearson Airport, Kansas City Airport and Sapporo's New Chitose Airport.
One rarer terminal design is the mobile lounge, where passengers are transported from the gate to their aircraft in a large vehicle which docks directly to the terminal and the aircraft. Washington Dulles International Airport, Mexico City International Airport, and Mirabel International Airport have used this design.
A common-use facility or terminal design disallows airlines to have its own proprietary check-in counters, gates and IT systems. Rather, check-in counters and gates can be flexibly reassigned as needed.
With an area of over (1,713,000 m²) and capacity of over 60 million passengers,Dubai International Airport (Terminal 3) in Dubai, United Arab Emirates, became the largest single Terminal building in the world when it opened on October 14, 2008. Other large scale airport terminal buildings with floor area over 500,000 m2 include Terminal 3 of Beijing Capital International Airport (986,000 m2), main terminal of Incheon International Airport in Seoul (594,000 m2), Terminal 1 of Hong Kong International Airport (570,000 m2), Suvarnabhumi Airport in Bangkok (563,000 m2) and Kunming Changshui International Airport (548,300 m2).
Many small and mid-size airports have a single two or three-lane one-way loop road which is used by local private vehicles and buses to drop off and pick up passengers.
An international airport may have two grade-separated one-way loop roads, one for departures and one for arrivals. It may have a direct rail connection by regional rail, light rail, or subway to the downtown or central business district of the closest major city. The largest airports may have direct connections to the closest freeway. There will be car rental agencies and taxi companies operating around the terminals. The Hong Kong International Airport has ferry piers on the airside to connect with ferry piers across the border.
- Check-in counters
- Retail stores and restaurants
- Busiest Airports – The Busiest Airports in the World. Geography.about.com. Retrieved on 2013-04-09.
- The 10 Worst Airport Terminals Slideshow at Frommer's. Frommers.com. Retrieved on 2013-04-09.
- World's 10 Most Beautiful Airport Terminals Slideshow at Frommer's. Frommers.com. Retrieved on 2013-04-09.
- McGraw-Hill Construction | ENR – Next Phase of Baggage Screening Goes In-line, Out ofView. Enr.construction.com (2003-12-15). Retrieved on 2013-04-09.
- New Terminal 3 to evoke 'tranquillity' – The National. Thenational.ae (2011-07-22). Retrieved on 2013-04-09.
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