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For other uses, see Airport (disambiguation).

An airport is a facility where aircraft can take off and land. At the very minimum, an airport consists of one runway (or helipad), but other common components are hangars and terminal buildings. Apart from these, an airport may have a variety of facilities and infrastructure, including fixed base operator services, air traffic control, passenger facilities such as restaurants and lounges, and emergency services. A military airport is known as an airbase in North American terminology (other countries may use the term airfield or air station in current parlance). The terms airfield and airstrip may also be used to refer to a facility that has nothing more than a runway. The term aerodrome refers to any surface used for take off or landing. The term airport refers to an aerodrome that is licensed by the responsible government organization (ie FAA, Transport Canada). Airports have to be maintained to higher safety standards. There are usually no minimum standards for a basic aerodrome.

Attributes

Airports vary in size, with smaller or less-developed airports often having only a single runway shorter than 1,000 m (3,300 ft). Larger airports for international flights generally have paved runways 2,000 m (6,600 ft) or longer. Many small airports have dirt, grass, or gravel runways, rather than asphalt or concrete.

In the United States, the minimum dimensions for dry, hard landing fields are defined by the FAR Landing And Takeoff Field Lengths. These include considerations for safety margins during landing and takeoff. Typically heavier aircraft require longer runways.

The longest public-use runway in the world is at Ulyanovsk-Vostochny International Airport, in Ulyanovsk, Russia. It has a length of 5,000 m (16,404ft).

As of 2005, there were approximately 50,000 airports around the world, including 19,815 in the United States alone.

Airport Ownership and Operation

Most of the world's airports are owned by local, regional, or federal government bodies who then lease the airport to private corporations who oversee the airport's entire operation. For example, the British firm BAA plc operates most of the commercial airports in the United Kingdom, as well as several other airports outside of the UK. Germany's Frankfurt International Airport is managed by the private firm Fraport AG.

In the United States, most airports are operated directly by government entities or government-created airport authorities (also known as port authorities). Only Indianapolis International Airport, which is owned by the City of Indianapolis and leased to BAA Indianapolis, Inc., a subsidiary of the British airport firm BAA plc, is entirely operated by a private entity. Many U.S. airports still lease part or all of their facilities to outside firms, who operate specific functions such as retail management and parking. In the United States, all commercial airport runways are certified by the Federal Aviation Administration, but maintained by the local airport under the regulatory authority of the FAA.

Despite the reluctance to privatize airports in the United States (despite the FAA sponsoring a privatization program since 1996), the government-owned/commercially operated (GOCO) arrangement is the standard for the operation of commercial airports in the rest of the world.

Airport structures

Airports are divided into landside and airside areas. Landside areas include parking lots, tank farms and access roads. Airside areas include all areas accessible to aircraft, including runways, taxiways and ramps. Access from landside areas to airside areas is tightly controlled at most airports. Passengers on commercial flights access airside areas through terminals, where they can purchase tickets, clear security, check or claim luggage and board aircraft. The waiting areas which provide passenger access to aircraft are typically called concourses, although this term is often used interchangeably with terminal.

The area where aircraft park next to a terminal to load passengers and baggage is known as a ramp (or, to the media and uninitiated, "the tarmac"). Parking areas for aircraft away from terminals are generally called aprons.

Both large and small airports can be towered or uncontrolled, depending on air traffic density and available funds. Due to their high capacity and busy airspace, most international airports have air traffic control located on site.

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 more conspicuous level of physical security, although in recent years, many contries have adopted the same level of security for international and domestic travel. (See Airport security later on this page.)

Shops and food services

Most international airports have shops and food courts. These services usually provide the passengers food and drinks before they board their flight. Many recognizable chain food restaurants have opened branches in large airports to serve often hungry passengers. London's Heathrow Airport, for example, is home to both a Harrods and a Hamleys Toy Shop, providing Duty Free for international passangers.

International areas usually have a duty-free shop where travellers are not required to pay the usual duty fees on items. Larger airlines often operate member-only lounges for premium passengers.

Airports have a captive audience, and consequently the prices charged for food is generally higher than are available elsewhere in the region. However, some airports now regulate food costs to keep them comparable to so-called "street prices".

Cargo and freight services

In addition to people, airports are responsible for moving large volumes of cargo around the clock. Cargo airlines often have their own on-site and adjecent infrastructure to rapidly transfer parcels between ground and air modes of transportation.

Support services

Aircraft maintenance, pilot services, aircraft rental, and hangar rental are most often performed by a fixed base operator (FBO). At major airports, particularly those used as hubs, airlines may operate their own support facilities.

Airport access

Many large airports in the world are located next to or even above railway trunk routes, for instance Frankfurt International Airport and Amsterdam-Schiphol Airport. For local access, many airports have local train lines, rapid transit, light rail lines or other mass transit systems, for instance the AirTrain JFK at John F. Kennedy International Airport in New York. These systems are usually directly connected to the main terminals. Large airports usually have access also through freeways from which cars fed into two access roads, designed as loops, one sitting on top of the other. One level is for departing passengers and the other is for arrivals.

History and development

The earliest airplane landing sites were simply open, grassy fields. The plane could approach at any angle that provided a favorable wind direction. A slight improvement was the dirt-only field, which eliminated the drag from grass. However these only functioned well in dry conditions. They would eventually be replaced by concrete surfaces that allowed all-weather landings in both daylight and at night.

Early airfields were often built for the purpose of entertainment. These aerodromes consisted of a grassy field, with hangar for storage and servicing of airplanes, and observation stands for the visitors. One of the first aerodrom of the world was Taliedo Airport in Milan; it was opened in the 1910 and in the mid 20's was transformed in an airport open to the commercial traffic. It was closed in the 30's because it was too small for the commercial transportation boom of those years. Few miles north was built the Linate Airport that is still opened today.

Increased aircraft traffic during World War I led to the construction of regular landing fields. Airplanes had to approach these from certain directions. This led to the development of aids for directing the approach and landing slope.

Following the war, some of these military airfields added commercial facilities for handling passenger traffic. One of the earliest such fields was Le Bourget, near Paris. The first international airport to open was the Croydon Airport, in South London [1]. In 1922, the first permanent airport and commercial terminal solely for commercial aviation was built at Königsberg, Germany. The airports of this era used a paved "apron", which permitted night flying as well as landing heavier airplanes.

The first lighting used on an airport was during the later part of the 1920s; in the 1930s approach lighting came into use. These indicated the proper direction and angle of descent. The colors and flash intervals of these lights became standardized under the ICAO. In the 1940s, the slope-line approach system was introduced. This consisted of two rows of lights that formed a funnel indicating an aircraft's position on the glideslope. Additional lights indicated incorrect altitude and direction.

Following World War II, airport design began to become more sophisticated. Passenger buildings were being grouped together in an island, with runways arranged in groups about the terminal. This arrangement permitted expansion of the facilities. But it also meant that passengers had to travel further to reach their plane.

An improvement in the landing field was the introduction of grooves in the concrete surface. These ran perpendicular to the direction of the landing aircraft and served to draw off excess water in rainy conditions that could build up in front of the plane's wheels.

Airport construction boomed during the 1960s with the increase in jet aircraft traffic. Runways were extended out to 3 km. The fields were constructed out of reinforced concrete using a slip-form machine that produces a continual slab with no disruptions along the length.

Modern landing fields are thickest in the area where the plane touchest down in order to support the force of the landing gear touching down. Runways are constructed as smooth and level as possible using measuring devices to correct for variations in height.

Airport designation and naming

Airports are uniquely represented by their IATA airport code and ICAO airport code. IATA airport codes are often abbreviated forms of the common name of the airport, such as PHL for Philadelphia International Airport. Airports sometimes retain their previous IATA code when an airport's name is changed. O'Hare International Airport in Chicago, Illinois retains the IATA code ORD, from its former name of Orchard Field.

The name of the airport itself can be its location, such as Los Angeles International Airport or Portland International Airport. It can be the name of a prominent national celebrity, commonly a politician, e.g. John F. Kennedy International Airport, Indira Gandhi International Airport, Chiang Kai-Shek International Airport or Charles de Gaulle International Airport. As well as politicians, airports may well be named after a person associated with the region it serves, such as Liverpool John Lennon Airport or Robin Hood Airport

Airports may also be named after prominent figures in aviation history. Kingsford Smith International Airport near Sydney, Australia is named after the pioneering Australian aviator Kingsford Smith. Similarly, San Diego International Airport is subtitled "Lindbergh Field" after Charles Lindbergh, who picked up his famous aircraft The Spirit of St. Louis from Teledyne Ryan Corporation's factory adjacent to the airport.

Airport security

Main article: Airport security

Airports are required to have safety precautions in most countries. Rules vary in different countries, but there are common elements worldwide. 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, 2001 attacks, airport security has been dramatically increased worldwide.

See also: Airport security repercussions due to the September 11, 2001 attacks

Airport operations

Outside the terminal, there is a large team of people who work in concert to ensure aircraft can land, take off, and move around quickly and safely. These processes are largely invisible to passengers, but they can be extraordinarily complex at large airports.

Air traffic control

See also: Air traffic control

Air traffic control (or ATC) is system whereby ground-based controllers direct aircraft movements, usually via radio. This coordinated oversight facilitates safety and speed in complex operations where traffic moves in all three dimensions. Air traffic control responsibilities at airports are usually divided into two main areas: ground and tower.

Ground Control is responsible for directing all ground traffic in designated "movement areas," except the traffic on runways. This includes planes, baggage trains, snowplows, grass cutters, fuel trucks, and a wide array of other vehicles. Ground Control will instruct these vehicles on which taxiways to use, which runway they will use (in the case of planes), where they will park, and when it is safe to cross runways. When a plane is ready to take off it will stop short of the runway, at which point it will be turned over to Tower Control. After a plane has landed, it will depart the runway and be returned to Ground Control.

Tower Control controls aircraft on the runway and in the controlled airspace immediately surrounding the airport. Tower controllers use radar to identify and accurately locate an aircraft's position in three-dimensional space. They coordinate the sequencing of aircraft in the traffic pattern and direct aircraft on how to safely join and leave the circuit. Aircraft which are only passing through the airspace must also contact Tower Control in order to be sure that they remain clear of other traffic and do not disrupt operations.

Traffic pattern

Main article: Airfield traffic pattern

All airports use a traffic pattern to assure smooth traffic flow between departing and arriving aircraft. Generally, this pattern is a circuit consisting of five "legs" that form a rectangle (two legs and the runway form one side, with the remaining legs forming three more sides). Each leg is named (see diagram), and ATC directs pilots on how to join and leave the circuit. Traffic patterns are flown at one specific altitude, usually 1000 ft AGL. Standard traffic patterns are left-handed, meaning all turns are made to the left. Right-handed patterns do exist, usually because of obstacles such as a mountain or to reduce noise for local residents. The predetermined circuit helps traffic flow smoothly because all pilots know what to expect, and helps reduce the chance of a mid-air collision.

At extremely large airports, a circuit is in place but not usually used. Rather, aircraft (usually only commercial with long routes) request approach clearance while they are still hours away from the airport, often before they even take off from their departure point. Large airports have a frequency called Clearance Delivery which is used by departing aircraft specifically for this purpose. This then allows airplanes to take the most direct approach path to the runway and land without worrying about interference from other aircraft. While this system keeps the airspace free and is simpler for pilots, it requires detailed knowledge of how aircraft are planning to use the airport ahead of time and is therefore only possible with large commercial airliners on pre-scheduled flights. The system has recently become so advanced that controllers can predict whether an aircraft will be delayed on landing before it even takes off; that aircraft can then be delayed on the ground, rather than wasting expensive fuel waiting in the air.

Navigational aids

Before takeoff, pilots usually check an Automatic Terminal Information Service (ATIS) for information about airport conditions where they exist. The ATIS contains information about weather, which runway and traffic patterns are in use, and other information that pilots should be aware of.

When flying, there are a number of aids available to pilots, though not all airports are equipped with them. A Visual Approach Slope Indicator (VASI) helps pilots fly a perfect approach for landing once they have found the airport. Some airports are equipped with a VHF omnidirectional range (VOR) to help pilots find the direction to the airport. VORs are often accompanied by a Distance Measuring Equipment (DME) to determine the distance to the airport. In poor weather, pilots will use an Instrument Landing System to find the runway and fly the correct approach, even if they cannot see the ground.

Larger airports sometimes offer Precision Approach Radar (PAR). The aircraft's horizontal and vertical movement is tracked via radar, and the controller tells the pilot his position relative to the approach slope. Once the pilots can see the runway lights, they may continue with a visual landing.

Guidance signs

Airport guidance signs provide direction and information to taxiing aircraft and airport vehicles and assist in safe and expedient movement of aircraft. Smaller airports may have few or no signs, relying instead on airport diagrams and charts.

There are two classes of signage at airports, with several types of each:

Operational guidance signs

• Location signs - yellow on black background. Identifies the runway or taxiway currently on or entering.
• Direction/Runway Exit signs - black on yellow. Identifies the intersecting taxiways the aircraft is approaching, with an arrow indicating the direction to turn.
• Other - Many airports use conventional traffic signs such as stop and yield signs throughout the airport.

Mandatory instruction signs

Mandatory instruction signs are white on red. They show entrances to runways or critical areas. Vehicles and aircraft are required to stop at these signs until the control tower gives clearance to proceed.

• Runway signs - White on a red. These signs simply identify a runway intersection ahead.
• Frequency Change signs - Usually a stop sign and an instruction to change to another frequency. These signs are used at airports with different areas of ground control.
• Holding Position signs - A single solid yellow bar across a taxiway indicates a position where ground control may require a stop. If a two solid yellow bars and two dashed yellow bars are encountered, this indicates a holding position for a runway intersection ahead; runway holding lines must never be crossed without permission. At some airports, a line of red lights across a taxiway is used during low visibility operations to indicate holding positions.

Lighting

Many airports have lighting that help guide planes using the runways and taxiways at night or in rain or fog.

On runways, green lights indicate the beginning of the runway for landing, while red lights indicate the end of the runway. Runway edge lighting is white lights spaced out on both sides of the runway, indicating the edge. Some airports have more complicated lighting on the runways including lights that run down the centerline of the runway and lights that help indicate the approach. Low-traffic airports may use Pilot Controlled Lighting to save electricity and staffing costs.

Along taxiways, blue lights indicate the taxiway's edge, and some airports have embedded green lights that indicate the centerline.

Wind indicators

Planes take-off and land into the wind in order to achieve maximum performance. Wind speed and direction information is available through the ATIS or ATC, but pilots need instantaneous information during landing. For this purpose, a windsock is kept in view of the runway.

Safety management

Air safety is an important concern in the operation of an airport, and almost every airfield includes equipment and procedures for handling emergency situations. Commercial airfields include one or more emergency vehicles and their crew that are specially equipped for dealing with airfield accidents, crew and passenger extractions, and the hazards of highly flammable airplane fuel. The crews are also trained to deal with situations such as bomb threats, hijacking, and terrorist activities.

Potential airfield hazards to aircraft include debris, nesting birds, and environmental conditions such as ice or snow. The fields must be kept clear of debris using cleaning equipment so that loose material doesn't become a projectile and enter an engine duct. In adverse weather conditions, ice and snow clearing equipment can be used to improve traction on the landing strip. For waiting aircraft, equipment is used to spray special deicing fluids on the wings.

Many airports are built near open fields or wetlands. These tend to attract bird populations, which can pose a hazard to aircraft in the form of bird strikes. Airport crews often need to discourage birds from taking up residence.

Depending on their configuration, an airport can have sections of their pavement where collisions between airplanes on the ground can tend to occur. Records are kept of any incursions where airplanes or vehicles are in an inappropriate location, allowing these "hot spots" to be identified. These locations then undergo special attention by the FAA and airport administrators in order to reduce accidents.

During the 1980s, a phenomenon known as microburst became a growing concern due to accidents caused by microburst wind shear. (For example, see Delta Air Lines Flight 191.) Microburst radar was developed as an aid to safety during landing, giving two to five minutes warning to aircraft in the vicinity of the field of a microburst event.

Some airfields now have a special surface material at the end of the runway that behaves somewhat like styrofoam, bringing the plane to a relatively rapid halt as the material disintegrates. These surfaces are useful when the runway is located next to a body of water or other hazard, and prevent the planes from overrunning the end of the field.

Environmental concerns

The traffic generated by airports both in the air and on the surface can be a major source of aviation noise and air pollution which may interrupt nearby residents' sleep and produce other noise health effects . The construction of new airports, or addition of runways to existing airports, is often resisted by local residents because of the effect on the countryside, historical sites, local flora and fauna. As well, due to the risk of collision between birds and airplanes, large airports undertake population control programs where they frighten or shoot birds to ensure the safety of air travellers.

The construction of airports has been known to change local weather patterns. For example, because they often flatten out large areas, they can be succeptible to fog in areas where fog rarely forms. In addition, because they generally replace trees and grass with pavement, they often change drainage patterns in agricultural areas, leading to more flooding, run-off and erosion in the surrounding land.

Military Airbase

Main article: Airbase

An Airbase, sometimes referred to as a military airport or airfield, provides basing and support of military aircraft. Some airbases provide facilites similar to their civilian counterparts. For example, RAF Brize Norton in Oxfordshire, England has a terminal which caters to passengers for the Royal Air Force's scheduled Tristar flights to the Falkland Islands. A special military airfield is an Aircraft Carrier.

Aircraft Carriers

Main article: Aircraft Carrier

An aircraft carrier is a warship that functions as a floating airport for military aircraft. Aircraft carriers allow a naval force to project air power great distances without having to depend on local bases for land-based aircraft. After their development in World War II, aircraft carriers rapidly replaced the battleship as the centrepiece of a modern fleet. Unescorted carriers are considered vulnerable to missile or submarine attacks and therefore travel as part of a carrier battle group that includes a wide array of other ships with specific functions.

Airports in entertainment

Airports have occasionally played major roles in motion pictures and television shows due to being transportation hubs, but also because of their unique characteristics. One such example of this is the movie The Terminal, a film about a man who becomes permanently grounded in an airport terminal and must survive only on the food and shelter provided by the airport. If nothing else, this movie demonstrates the sustaining properties of airport terminals. Movies such as Airplane!, Airport, Die Hard II, Jackie Brown, Get Shorty, and The Langoliers also revolve around the unique culture of the major city airports.

Airport Directories

Each national aviation authority has its own system for pilots to be able to keep track of information about airports in their country.

• The United States uses the Airport/Facility Directory (A/FD), seven volumes that contain information such as elevation, airport lighting, runway information, communications, hours of operation, nearby NAVAIDs and much more.
• In Canada, a single publication, the Canada Flight Supplement (CFS) provides equivalent information.

• The most comprehensive, consumer/business directory of commercial airports in the world (primarily for airports as businesses, rather than for pilots) is organized by the trade group Airports Council International.

See also

• List of airports
• Heliport
• World's busiest airport
• List of aviation topics
• NIMBY

External links

• AirNav.com - complete list of U.S. airports, with detailed airport information
• eFAD - the most powerful electronic airport directory (A/FD) on earth!
• National and international airports
• ATCSCC Real-time Airport Status page - shows airport delay times for major U.S. airports
• AFRICASPOTTER.at.tt - Airports in Southern Africa
• U.S. airport security
• Department for Transport (United Kingdom)
• History of Aircraft Landing Aids
• Airport satellite images

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