Airport
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[[Image:Incheon International Airport-2.jpg|thumb|right|The passenger terminal buildings at [[Incheon International Airport]], Incheon, [[South Korea]], considered a large airport.]]
[[Image:Plane arrival at Barra Airport.jpg|thumb|[[Barra Airport (Scotland)|Barra Airport]], [[Outer Hebrides]], [[Scotland]], the world's only airport using a beach runway for scheduled services.]]
[[Image:Airport overhead.jpg|thumb|right|[[Paraparaumu Airport]], a medium-sized airport]]
[[Image:JBU-A320.JPG|thumb|right|[[JetBlue Airways]] at [[Cibao International Airport]], [[Santiago de los Caballeros|Santiago]], [[Dominican Republic|DR]].]]
An '''airport''' is a facility where [[aircraft]] such as [[Fixed-wing aircraft|airplanes]], [[helicopter]]s, and [[Non-rigid airship|blimps]] take off and land. Aircraft may also be stored or maintained at an airport. An airport consists of at least one surface such as a [[runway]], a [[helipad]], or water for [[takeoff]]s and [[landing]]s, and often includes buildings such as [[hangar]]s and [[airport terminal|terminal]] buildings.
Larger airports may have a variety of facilities and infrastructure, including [[fixed base operator|fixed base operator services]], [[seaplane]] docks and ramps, [[air traffic control]], passenger facilities such as restaurants and lounges, and [[emergency service]]s. A [[military]] airport is known as an [[airbase]] or air station. The terms '''airfield''', '''airstrip''', and '''[[aerodrome]]''' may also be used to refer to airports, and the terms '''[[heliport]]''', '''seaplane base''', and '''[[STOLport]]''' refer to airports dedicated exclusively to helicopters, seaplanes, or [[STOL|short takeoff and landing]] aircraft. In some jurisdictions, the term ''airport'' is used where the facility is licensed as such by the relevant government organization (e.g. [[Federal Aviation Administration]] (FAA), [[Transport Canada]]). Elsewhere the distinction is merely one of general appearance. Yet other areas define an air''port'' by its having the necessary customs offices etc expected of a port,{{Fact|date=December 2007}} though the more general term is [[airport of entry]].
==Attributes==
[[Image:20 airtransportation inv.svg|thumb|The international [[public domain]] symbol for air transportation, created by [[AIGA]].]]
Smaller or less-developed airports—which represent the vast majority—often have a single runway shorter than 1,000 m (3,300 ft). Larger airports for [[airline]] 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 [[Federal Aviation Regulations|FAR Landing And Takeoff Field Lengths]]. These include considerations for safety margins during landing and takeoff. Heavier aircraft require longer runways.
The longest public-use runway in the world is at [[Qamdo Bangda Airport]] in China. It has a length of 5,500 m (18,045 ft). The world's widest paved runway is at [[Ulyanovsk Vostochny Airport]] in Russia and is 105 m (344 ft) wide.
As of 2006, there were approximately 49,000 airports around the world, including 14,858 in the US., the U.S. having the most in the world<ref>[https://www.cia.gov/library/publications/the-world-factbook/fields/2053.html CIA World Factbook]</ref>
===Airport ownership and operation===
[[Image:SBGL01.jpg|thumbnail|right|[[Rio de Janeiro-Galeão International Airport]].]]
Most of the world's airports are owned by local, regional, or national [[government]] bodies who then lease the airport to private [[corporation]]s who oversee the airport's operation. For example, [[BAA Limited]] (BAA) operates seven of the commercial airports in the [[United Kingdom]], as well as several other airports outside of the UK. [[Germany]]'s [[Frankfurt Airport]] is managed by the quasi-private firm [[Fraport]].
In the US and Canada, commercial airports are generally operated directly by government entities or government-created [[airport authorities]] (also known as port authorities).
[[Image:Flughafen Frankfurt am Main.JPG|thumb|[[Frankfurt Airport]] is managed by [[Fraport]]]]
Many US airports still lease part or all of their facilities to outside firms, who operate functions such as retail management and parking. In the US, all commercial airport runways are certified by the FAA, but maintained by the local airport under the regulatory authority of the FAA.
Despite the reluctance to privatize airports in the US (despite the FAA sponsoring a privatization program since 1996), the [[List of modern AFV and artillery related terms and acronyms#G|government-owned, contractor-operated]] (GOCO) arrangement is the standard for the operation of commercial airports in the rest of the world.
In [[New Zealand]], [[Auckland International Airport]], the nation's main [[international airport]], is fully privatised. Ownership and operation of the 1,497 [[hectare]] complex is vested entirely with Auckland International Airport Limited, a [[public company]], with the only governmental involvement being [[Airways Corporation of New Zealand]]'s operation of air traffic control systems. Similar arrangements pertain to [[Wellington International Airport|Wellington]] and [[Christchurch International Airport|Christchurch]] airports, and most other main airports are operated by private companies.
In [[Argentina]], 32 airports including the main airport [[Ministro Pistarini International Airport]] are operated by Aeropuertos Argentina 2000, a private company. On the other hand, 3 airports are operated by another company named London Supply.
===Airport structures===
[[Image:HYD - Meet and greet area 1.jpg|thumb|A terminal at Hyderabad International Airport]]
[[Image:HYD-interntaional departure level.jpg|thumb|International departure level at Hyderabad]]
[[Image:Mumbai Airport.jpg|thumb|A terminal at Chhatrapati Shivaji International Airport]]
Airports are divided into ''landside'' and ''airside'' areas. Landside areas include [[parking lot]]s, [[public transport]]ation [[train station]]s, [[oil depot|tank farm]]s and access [[road]]s. Airside areas include all areas accessible to aircraft, including [[runway]]s, [[taxiway]]s, [[Airport ramp|ramp]]s and tank farms. Access from landside areas to airside areas is tightly controlled at most airports. Passengers on [[airline|commercial flights]] access airside areas through terminals, where they can purchase tickets, clear security, check or claim luggage and board aircraft through [[Gate (airport)|gates]]. 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 called aprons
Airports can be [[control tower|towered]] or [[non-towered airport|non-towered]], depending on air traffic density and available funds. Due to their high capacity and busy [[airspace]], many international airports have air traffic control located on site.
Airports with international flights have [[Customs (tax)|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.
Modern engineers and architects are developing "[[floating airport]]s" which could be located several miles at sea and which would use designs such as [[pneumatic stabilized platform]] technology.
=== Shops and food services ===
[[Image:BGdutyfree.jpg|thumb|right|Duty free shopping area at [[Ben Gurion International Airport]] in [[Tel Aviv]], [[Israel]]]]
[[Image:HFX Airport 5.jpg|thumb|right|Food court and shops, [[Halifax International Airport]]]]
Airports have a captive audience, and consequently the prices charged for food are generally higher than are available elsewhere in the region. However, some airports, such as [[John F. Kennedy International Airport]]'s Terminal 8, have no restaurants at all. Airport fees are fees paid for use of services of airports, such as in the [[Subic Bay International Airport]]. However, some airports now regulate food costs to keep them comparable to so-called "street prices". This term is misleading as prices often match the manufacturer's [[suggested retail price]] (MSRP) but are almost never discounted.
=== Premium and VIP services ===
Several mid-large size airports also have facilities for premium passengers. In the US, these lounges are typically for international or [[Flight length|long-haul]] [[First class (aviation)|first]] and [[business class]] passengers, paid members, and elite-level [[Frequent flyer program|frequent fliers]] on long haul flights (regardless of what class they are in). In the rest of the world, the lounges are not open to purchase, but can be used by all premium passengers and most elite frequent fliers. Some lounges are comparatively spartan and only offer a quiet place to sit and work; other lounges include meals and massage services.
===Cargo and freight services===
In addition to people, airports are responsible for moving large volumes of cargo around the clock. [[Cargo airline]]s often have their own on-site and adjacent 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 [[airline hub|hubs]], airlines may operate their own support facilities.
[[Image:Nouveau aeroport alger tarmac.png|thumb|International [[Airport terminal|terminal]], Hall 1 and Hall 1, at [[Houari Boumedienne Airport]], [[Algiers]], [[Algeria]]]]
Some airports, typically military airbases, have long runways used as emergency landing sites. Many airbases have arresting equipment for fast aircraft, known as [[arresting gear]] – a strong cable suspended just above the runway and attached to a hydraulic [[Gear ratio|reduction gear]] mechanism. Together with the landing aircraft's [[tailhook|arresting hook]], it is used in situations where the [[brake]]s would have little or no effect.
=== Airport access ===
Many large airports in the world are located next to or even above [[Rail transport|railway]] trunk routes, for instance Frankfurt Airport, [[Amsterdam Airport Schiphol]], [[London Heathrow Airport]], [[London Gatwick Airport]] and [[London Stansted Airport]]. For local access, many airports have local train lines, [[rapid transit]], [[light rail]] lines or other [[public transport]] systems, for instance the [[AirTrain JFK]] at John F. Kennedy International Airport in [[Transportation in New York City|New York]] and the [[Silver Line (MBTA)|Silver Line]] T at [[Boston, Massachusetts|Boston's]] [[Logan International Airport]] by the [[Massachusetts Bay Transportation Authority]] (MBTA). These systems are usually directly connected to the main terminals. Large airports usually have access also through [[freeway]]s 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. This road concept was pioneered at [[Los Angeles International Airport]].
=== Internal transport ===
The distances passengers need to move within a large airport can be substantial. It is common for airports to provide [[moving walkway]]s and buses. The [[Hartsfield-Jackson Atlanta International Airport]] has a tram that takes people through the Concourses and Baggage Claim.
==History and development==
[[Image:Qantas Replica Mascot Airport.JPG|thumbnail|Qantas [[Avro 504|AVRO 504K]] replica, first plane flown by [[Qantas]], [[Sydney Airport]]]]
The earliest airplane takeoff and landing sites were 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 daylight and at night.
The title of "world's oldest airport" is disputed, but [[College Park Airport]] in [[Maryland]], US, established in 1909 by [[Wright brothers|Wilbur Wright]], is generally agreed to be the world's oldest continually operating airfield<ref>[http://www.pgparks.com/places/historic/cpairport.html College Park Airport]</ref>, although it serves only general aviation traffic.
[[Bremen Airport]] opened in [[1913]] and remains in use, although it served as an American military field between 1945 and 1949. Amsterdam Schiphol Airport opened on [[September 16]], [[1916]] as a military airfield, but only accepted [[Civil aviation|civil aircraft]] from [[December 17]], [[1920]], allowing [[Sydney Airport]] in [[Sydney]], [[Australia]]—which started operations in January 1920—to claim to be one of the world's oldest continually operating commercial airport.<ref>[http://www.sydneyairport.com.au/NR/rdonlyres/353DC91E-A259-449B-8B68-C8E88CB58691/0/FactSheetHistory1.pdf Airport history]</ref>.
The first known usage of the term "airport" appeared in a newspaper article in 1919, in reference to [[Bader Field]] in [[Atlantic City, New Jersey]].<ref>[http://www.pressofatlanticcity.com/news/newjersey/story/6787513p-6655816c.html Atlantic City airport, where 'air-port' coined, closing]</ref>
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 [[Paris - Le Bourget Airport]] at [[Le Bourget]], near [[Paris]]. The first international airport to open was the [[Croydon Airport]], in South [[London]], although an airport at [[Hounslow]] had been temporarily operating as such for nine months.<ref>[http://sutton.aprsmartlogik.com/cgi-bin/sutton/htm_hl.pl?DB=lbsutton&STEMMER=en&WORDS=airport&ALL=&ANY=&EXACTB=0&PHRASE=&EXACTP=0&CATEGORIES=&SIMPLE=Cryodon%20airport&COLOUR=014A77&STYLE=s&URL=http://www.sutton.gov.uk/leisure/heritage/Beddington/croydonairport.htm#muscat_highlighter_first_match Croydon Airport]</ref><ref>[http://ebasic.easily.co.uk/05F04C/02D020/page2.html History of Croydon Airport]</ref> In 1922, the first permanent airport and commercial terminal solely for commercial aviation was built at [[Königsberg, Bavaria|Königsberg]], [[Germany]]. The airports of this era used a paved "apron", which permitted night flying as well as landing heavier airplanes.
[[Image:2006airport.PNG|thumb|left|Airports in 2006]]
The first lighting used on an airport was during the later part of the 1920s; in the 1930s [[Approach lighting system|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 [[International Civil Aviation Organization]] (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 [[Instrument landing system|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 (9,800 ft). 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 runways are thickest in the area where airplanes move slowly and are expected to have maximum load, i.e. runway ends. A common myth is that airplanes produce their greatest load during landing due to the "impact" of landing. This is untrue as much of the aircraft weight remains on the wings due to lift. Runways are constructed as smooth and level as possible.
==Airport designation and naming==
{{main|List of airports}}<!-- This list doesn't need additional examples, Airport is an article not a list add airports to the List of airports page -->
Airports are uniquely represented by their [[International Air Transport Association airport code]] and [[International Civil Aviation Organization airport code|ICAO airport code]]. [[International Air Transport Association]] (IATA) [[airport code]]s 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]] retains the IATA code ORD, from its former name of Orchard Field.
The name of the airport itself can be its location, such as [[Hong Kong International Airport]]. It can be the name of a celebrity, commonly a [[politician]], e.g. [[Ninoy Aquino International Airport]], [[Indira Gandhi International Airport]], [[Atatürk International Airport]], [[Toronto Pearson International Airport]], [[Montréal-Pierre Elliott Trudeau International Airport]] or [[Charles de Gaulle International Airport]]. Airports may also be named after a person associated with the region it serves or prominent figures in aviation history, such as [[Will Rogers World Airport]], [[Liverpool John Lennon Airport]], [[Imam Khomeini International Airport]], or more recently Belfast City Airport was renamed [[George Best Belfast City Airport]] in memory of the [[Association football|football]] star who was born in [[Northern Ireland]].
Airport names may include the word "International" reflecting their ability to handle international aviation traffic, although the airport may not actually operate any such flights, such as [[Texel International Airport]]. Some airports with international immigration facilities may also choose to drop the word from their airport names (eg. [[Perth Airport]], [[Singapore Changi Airport]]).
== Airport security ==
{{main|Airport security}}
[[Image:Flughafenkontrolle.jpg|thumb|right|Baggage is scanned using [[X-ray machine]]s, passengers walk through [[metal detector]]s]]
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.
{{seealso|Airport security repercussions due to the September 11, 2001 attacks}}
== Airport operations ==
Away from the terminal, there is a large team of people who work to ensure aircraft can land, take off, and move around quickly and safely.
===Air traffic control===
{{seealso|Air traffic control}}
The majority of the world's airports are [[non-towered airport|non-towered]], with no air traffic control presence. However, at particularly busy airports, or airports with other special requirements, there is an air traffic control (ATC) system whereby [[Air traffic controller|controllers]] (usually ground-based) direct aircraft movements via [[radio]] or other communications links. 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 at least two main areas: ''ground'' and ''tower'', though a single controller may work both stations. The busiest airports also have ''clearance delivery'', ''apron control'', and other specialized ATC stations.
'''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.
[[Image:HFX Airport 4.jpg|thumb|View of the apron from the top floor observation room, [[Halifax International Airport]]]]
'''[[Control tower|Tower]] Control''' controls aircraft on the runway and in the [[controlled airspace]] immediately surrounding the airport. Tower controllers may use [[radar]] to locate an aircraft's position in three-dimensional space, or they may rely on pilot position reports and visual observation. 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.
===Traffic pattern===
All airports use a [[Airfield traffic pattern|traffic pattern]] (often called a ''traffic circuit'' outside the U.S.) 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 800 or 1,000 ft (244 m or 305 m) [[above ground level]] (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===
[[Image:Vasi-1.JPG|thumb|right|Standard Visual Approach Slope Indicator]]
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 the approach for landing. 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 VOR. VORs are also located off airports, where they serve to provide airways for aircraft to navigate upon. In poor weather, pilots will use an [[instrument landing system]] (ILS) to find the runway and fly the correct approach, even if they cannot see the ground. The number of instrument approaches based on the use of the [[Global Positioning System]] (GPS) is rapidly increasing and may eventually be the primary means for instrument landings.
Larger airports sometimes offer [[precision approach radar]] (PAR), but these systems are more common at military air bases than civilian airports. The aircraft's horizontal and vertical movement is tracked via radar, and the controller tells the pilot his position relative to the [[Final approach (aviation)|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. 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====
[[Image:PHXtaxi.jpg|thumb|right|Taxiing aircraft at [[Phoenix Sky Harbor International Airport]]]]
*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 sign]]s such as [[stop sign|stop]] and [[yield sign|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 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===
[[Image:App. light.gif|thumb|Runway [[approach lighting system|approach lighting]].]]
Many airports have [[runway#Runway lighting|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 Lights|Runway edge lighting]] consists of 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 (an [[Approach Lighting System]], or ALS). 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.
===Weather observations===
{{seealso|Surface weather observation|Automated airport weather station|Automatic weather station}}
Weather observations at the airport are crucial to safe take-offs and landings. In the US and Canada, the vast majority of airports, large and small, have some form of automated airport [[weather station]], whether an AWOS, ASOS or AWSS.{{Fact|date=January 2008}} Most larger airports also have human observers to provide additional observations to supplement the automated station. These weather observations are available over the radio, through [[Automatic Terminal Information Service]] (ATIS) or via the ATC.
Planes take-off and land ''into'' the wind in order to achieve maximum performance. Because pilots need instantaneous information during landing, a [[windsock]] is also 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 vehicle]]s and their crew that are specially equipped for dealing with airfield [[accident]]s, crew and passenger extractions, and the hazards of highly flammable [[aviation fuel]]. The crews are also trained to deal with situations such as [[bomb threat]]s, [[Aircraft hijacking|hijacking]], and [[terrorism|terrorist]] activities.
[[Image:Controlled impact demonstration dummies.jpg|thumb|NASA air safety experiment ([[Controlled Impact Demonstration|CID project]])]]
Potential hazards to aircraft include debris, nesting [[bird]]s, and reduced friction levels due to environmental conditions such as [[ice]], [[snow]], or [[rain]]. Part of runway maintenance is [[airfield rubber removal]] which helps maintain friction levels. 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 (see [[foreign object damage]]). 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 [[wetland]]s. These tend to attract bird populations, which can pose a hazard to aircraft in the form of [[bird strike]]s. Airport crews often need to discourage birds from taking up residence.
Some airports are located next to parks, golf courses, or other low-density uses of land. Other airports are located near densely-populated urban or suburban areas. In the 1980s, a conflict arose in [[San Jose, California]], when a plane attempting to land at [[Reid-Hillview Airport]] (built in the 1930s) collided with a [[Macy's]] [[department store]] at the Eastridge shopping mall. Many local residents tried to get the airport shut down, even though it had been there for fifty years: their neighborhoods (and the mall) were about a decade old.{{Fact|date=July 2007}}
An airport can have areas where collisions between airplanes on the ground tend to occur. Records are kept of any [[runway incursion|incursions]] where airplanes or vehicles are in an inappropriate location, allowing these "hot spots" to be identified. These locations then undergo special attention by transportation authorities (such as the FAA in the US) and airport administrators.
During the 1980s, a phenomenon known as [[microburst]] became a growing concern due to [[accident]]s 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 known as soft concrete 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.
==Airport ground crew==
[[Image:KLM 777 pushback.jpg|thumb|right|An aircraft tow tractor moving a KLM Boeing 777]]
{{main|Ground Support Equipment}}
Most airports have ground crew handling the loading and unloading of passengers, crew, baggage and other services.{{Fact|date=October 2007}} Some ground crew are linked to specific airlines operating at the airport.
==Environmental concerns==
The traffic generated by airports both in the air and on the surface can be a major source of [[Aircraft noise|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]]. Due to the risk of collision between birds and airplanes, large airports undertake population control programs where they frighten or shoot birds.
The construction of airports has been known to change local [[weather]] patterns. For example, because they often flatten out large areas, they can be susceptible to fog in areas where fog rarely forms. In addition, because they generally replace [[tree]]s and grass with pavement, they often change [[drainage]] patterns in [[Agriculture|agricultural]] areas, leading to more [[flood]]ing, run-off and [[erosion]] in the surrounding land.
Some of the airport administrations prepare and publish annual [[Environmentalism|environmental]] reports in order to show how they consider these environmental concerns in airport management issues and how they protect environment from airport operations. These reports contains all environmental protection measures performed by airport administration in terms of water, air, soil and noise pollution, resource conservation and protection of natural life around the airport.
==Military airbase==
{{main|Airbase}}
An airbase, sometimes referred to as a ''military airport'' or ''airfield'', provides basing and support of [[military aircraft]]. Some airbases provide facilities 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 [[Lockheed L-1011|Tristar]] flights to the [[Falkland Islands]]. Military airbases may also be co-located with civilian airports, sharing the same tower/air traffic control facilities, runways, taxiways and emergency services, but with separate terminals, parking areas, hangars and [[Hardened Aircraft Shelter|shelter areas]]. Examples of this are [[Bardufoss Airport]]/[[Bardufoss Air Station]] and [[Oslo Airport, Gardermoen|Gardermoen Airport]]/[[Gardermoen Air Station]], both in [[Norway]]. A special variant of a military airfield is the [[aircraft carrier]].
===Aircraft carriers===
{{main|Aircraft carrier}}
An aircraft carrier is a [[warship]] that functions as a floating airport for military aircraft. Aircraft carriers allow a [[navy|naval force]] to project [[Aerial warfare|air power]] great distances without having to depend on local bases for land-based aircraft. After their development in World War I, aircraft carriers replaced the [[battleship]] as the centrepiece of a modern [[Naval fleet|fleet]] during World War II. 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 played major roles in [[Film|motion pictures]] and [[television program]]s due to being transportation hubs, but also because of their 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. Movies such as ''[[Airplane!]]'', ''[[Airport (film)|Airport]]'', ''[[Die Hard 2]]'', ''[[Soul Plane]]'', ''[[Jackie Brown (film)|Jackie Brown]]'', ''[[Get Shorty]]'', ''[[Home Alone]]'', ''[[Liar Liar]]'', ''[[Passenger 57]]'', ''[[Final Destination]]'', ''[[Unaccompanied Minors]]'', ''[[Catch Me if You Can]]'', ''[[Rendition]]'' and ''[[The Langoliers]]'', as well as television series like ''[[Lost (TV series)|Lost]], America's Next Top Model Cycle 10'' also have significant parts of their story set within airports.
Several computer simulation games put the player in charge of an airport. These include [[Airport Tycoon]] and the sequels; [[Airport Tycoon 2]] and [[Airport Tycoon 3]]. There is also a Japanese series of games called [[Air Traffic Controller (video game)|Air Traffic Controller]].
==Airport directories==
{{seealso|Civil Aviation Authority|Aeronautical Information Service}}
Each national aviation authority has a source of information about airports in their country. This will contain information on airport height, airport lighting, runway information, communications facilities and frequencies, hours of operation, nearby NAVAIDs and contact information where prior arrangement for landing is necessary.
* '''[[Australia]]'''<br />Information can be found on-line in the '''[http://www.airservices.gov.au/publications/aip.asp?pg=10 En route Supplement Australia (ERSA)] ''' which is published by [[Airservices Australia]], a government owned corporation charged with managing Australian ATC.
* '''[[Canada]]'''<br />Two publications, the '''[[Canada Flight Supplement]] (CFS)''' and the '''Water Aerodrome Supplement''' provides equivalent information.
* '''[[Europe]]'''<br />The [[European Organisation for the Safety of Air Navigation]] (EUROCONTROL) provides an [[Aeronautical Information Publication]] (AIP), [[aeronautical chart]]s and [[NOTAM]] services for multiple European countries.
*'''[[Germany]]'''<br />Provided by the '''[[Federal Office for Civil Aviation of Germany]]'''.
*'''[[France]]'''<br />'''Aviation Generale Delage''' edited by Delville and published by Breitling.
* '''The [[United Kingdom]] and the [[Republic of Ireland]]'''<br />The information is found in Pooley's Flight Guide, a publication compiled with the assistance of the [[United Kingdom Civil Aviation Authority]] (CAA). Pooleys also contains information on some continental European airports that are close to Great Britain. [[National Air Traffic Services]], the UK's [[Air Navigation Service Provider]], a [[public-private partnership]] also publishes an online AIP for the UK.
* '''The [[United States]]'''<br />The US uses the '''[[Airport/Facility Directory]] (A/FD)''', published in seven volumes.
* A 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==
{{commons|Airport}}
* [[Domestic airport]]
*[[List of countries by number of airports]]
* [[List of airports]]
* [[List of aviation topics]]
* [[List of hub airports]]
* [[Model airport]]
* [[NIMBY]]
* [[Port]]
* [[Regional airport]]
* [[Total Airport Management Systems]]
* [[World's busiest airport]]
* [[Heliport]]
==References==
{{reflist|2}}
==External links==
* [http://www.airports.org Airports Council International] (ACI)—industry group representing over 1,600 major airports.
* [http://www.aci.aero/aci/aci/file/Publications/ACI%20Annual%20Report%202006%20FINAL.pdf ACI 2006 annual report] (PDF)—includes airport traffic information and forecasts.
* [http://www.iata.org/ International Air Transport Association] (IATA)—representing the world's major airlines.
* [http://www.centennialofflight.gov/essay/Government_Role/landing_nav/POL14.htm History of aircraft landing aids]
{{Aviation lists}}
{{Commercial air travel}}
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