Airport rail link

An airport rail link is a service providing passenger rail transport from an airport to a nearby city by mainline or commuter trains, rapid transit, people mover, or light rail. Direct links operate straight to the airport terminal, while other systems require an intermediate use of people mover or shuttle bus.

Although airport rail links have been popular solutions in Europe and Japan for decades, only recently have links been constructed in North America, Oceania, and the rest of Asia. Advantages for the rider include faster travel time and easy interconnection with other public transport, while authorities have benefited from less highway and parking congestion, less pollution, and additional business opportunities. Additionally, the links benefit airports by drawing in more passengers via easy access.

Mass transit
For airports built within or close to the city limits, extending mass transit urban rail systems like rapid transit or light rail to airport terminals allows full integration with other public transport in the city, and seamless transport to all parts of town. Service frequency will be high, although travel time is a drawback as the services make many intermediate stops before reaching the city center and thus there may not be enough space for the baggage commonly carried by airport-bound passengers. Furthermore, luggage stowing facilities are not commonly found on mass transit vehicles as their primary objective is to provide high-capacity transport, as in the Airport, Inner West & South Line in Sydney, Australia. A common solution involves building a separate people mover from a mass transit station to the airport terminal (see below), often using automated systems, allowing faster travel time and fare discrimination, for instance Orlyval. Because they are solely dedicated to passengers using the airport, luggage stowing facilities are more likely to appear on these systems.

The first rapid transit station to connect an airport with a mass transit system was the Berlin U-Bahn’s Paradestraße station which opened in 1927 as Flughafen (Airport) and was built to provide direct access to Berlin Tempelhof Airport. The connection between Tempelhof Airport and the Berlin U-Bahn at Paradestraße was however revoked in 1937 and the preceding station Platz der Luftbrücke was instead granted that connection and remained so until Tempelhof Airport’s closure in 2008. Other early examples of mass transit stations located at airports include the MBTA Blue Line’s Airport station which is situated at Boston’s Logan International Airport and opened for service in 1952 and rebuilt in 2004, and Cleveland RTA Rapid Transit Red Line’s Cleveland Hopkins International Airport station which opened in 1968 and rebuilt in 1994, although Cleveland’s rapid transit is considered the first direct airport-to-downtown rapid transit system in the Western Hemisphere. Boston’s Blue Line requires a short bus transfer from the airport rail station to the airport terminal.

Mainline rail
Dedicated railway lines to airports have become popular since the 1980s. In many cases, there are stations at the airport terminal(s) for express, intercity and commuter trains, allowing direct travel to the check-in halls. In most cases, this solution requires the building of new track, whether it is a newly built main line or a branch (spur) line from an existing main line.

A cheaper option is to open a new station on an existing line, again connected to the airport by people mover or shuttle bus (see below). While this option is commonly chosen to reduce construction costs, it is only feasible when the station is located within proximity to the airport itself. Some early examples of mainline rail stations built to serve an airport are Berlin Schönefeld Flughafen station (which opened in 1951 and serves Berlin Schönefeld Airport), Brussels National Airport railway station (which opened in 1958 and serves Brussels Airport) and Frankfurt Airport regional station (which opened in 1972 and is one of the two railway stations that serve Frankfurt Airport).

Integration with intercity services has produced alliances where airlines sell air tickets that include the connecting rail service. Central Europe has seen integration of high-speed rail into airports, with domestic and international TGV and ICE services from Charles de Gaulle Airport in Paris and Frankfurt Airport. Because of this, many airport railway stations have received IATA codes.

Yet another option for airports is to use a high-speed “airport express” train to the city centre, especially if the airport is outside the urban area and some way from the mass transit system, but a direct downtown service is required, such as Flytoget serving Oslo Airport, Gardermoen. There are various ways this can be done: it may operate on a combination of existing and newly built mainline rail or mass transit track using a dedicated fleet of rolling stock designed for airport service. These solutions often have the drawback of lower frequencies (e.g. twice per hour), and often charge a premium fare higher than other services, but are more likely to have luxury features such as luggage racks, power outlets, Wifi, and washrooms.

Most dedicated railways use mainline trains and trackage, while mass transit “airport express” lines are usually found in Asia, as in the case of the Airport Express Line in Hong Kong. Other airports, such as Heathrow Airport, are served by both express trains and mass transit.

Shuttle
In many cases, there is no train station directly at the airport, usually because the infrastructure on which the service operates makes it impractical to build such a station. When this happens, a shuttle system is required for the last part of the journey; using either a people mover (often automated, such as AirTrain JFK in New York City) or a bus. The former allows low operating costs and higher perceived quality; the latter does not require specialized infrastructure to be built, and is often the preferred choice at smaller or low-cost airports. Shuttles do not provide a direct connection, and often involve a wait for a transfer to the next stage of the journey. Thus their market shares are often lower.

In some airports, such as San Francisco International Airport, the rail link may not serve some or all of the terminals or concourses directly; passengers using terminals that lack such connections must use a people mover or airport circulator to access their terminal. These circulators typically also serve parking lots, and sometimes airport hotels and off-site car rental locations.

Connection types
One-seat ride via main-line train
Commuter rail-type service directly from a city centre to the airport, without needing to change trains and sometimes without intermediate stops.

Africa
Casablanca Airport, Morocco, via ONCF.
Johannesburg OR Tambo International Airport via Gautrain

Asia
Bangkok, Pathumthani (Pass Don Muang International Airport (Older name Bangkok International Airport) and Samutprakarn (Pass Suvarnabhumi International Airport)
Don Muang International Airport via State Railway of Thailand
Suvarnabhumi Airport via Suvarnabhumi Airport Express (State Railway of Thailand, Ministry of Transport)
Changchun Longjia International Airport via Changchun–Jilin Intercity Railway
Chengdu Shuangliu International Airport via Chengdu-Mianyang-Leshan Intercity Railway
Chennai International Airport via Chennai Metro
Guiyang Longdongbao International Airport via Guiyang–Guangzhou High-Speed Railway
Haikou Meilan International Airport via Hainan Eastern Ring Railway
Hong Kong International Airport via Airport Express
İzmir Adnan Menderes Airport via Suburban Train of İzmir
Jakarta Soekarno-Hatta International Airport via Soekarno-Hatta ARS
Kuala Lumpur International Airport via KLIA Ekspres
Lanzhou Lanzhou Zhongchuan Airport via Lanzhou–Zhongchuan Airport Intercity Railway
Medan Kualanamu International Airport via Kualanamu ARS
Nagoya Chubu Centrair International Airport via Nagoya Railroad’s Meitetsu Airport Line
Osaka Kansai International Airport via JR West’s Haruka and Nankai Railway’s Rapi:t
Padang Minangkabau International Airport via Minangkabau Airport Rail Link
Phnom Penh International Airport from Phnom Penh railway station
Pyongyang Pyongyang International Airport via Korean State RailwayPyongui Line Sunan Station
Sanya Phoenix International Airport via Hainan Western Ring Railway
Sapporo New Chitose Airport via JR Hokkaido’s Chitose Line
Seoul Incheon and Gimpo airports via A’REX
Sendai Airport via Sendai Airport Line
Shanghai
Shanghai Hongqiao International Airport via High Speed Rail lines to Beijing, Hangzhou, and Nanjing
Shanghai Pudong International Airport via Shanghai Maglev Train
Shenzhen
Shenzhen Bao’an International Airport via Shenzhen Metro Line 11
Tel Aviv Ben Gurion International Airport via Israel Railways
Tokyo Narita International Airport via JR East’s Narita Express and Keisei Electric Railway’s Skyliner
Tokyo International Airport (Haneda Airport) via Tokyo Monorail and Keikyu’s Airport Line
Taipei Taiwan Taoyuan International Airport (TPE) express train to Taipei Main Station. Part of Taoyuan Mass Rapid Transit System.
Turpan Jiaohe Airport via Turpan North Station of the Lanzhou–Ürümqi High-Speed Railway
Vladivostok International Airport via Aeroexpress, also makes several stops along the way in a commuter service
Wuhan Tianhe International Airport via Tianhe Airport Station of the Wuhan–Xiaogan Intercity Railway
Zhengzhou Xinzheng International Airport via Xinzheng Airport Station of the Zhengzhou–Xinzheng Airport Intercity Railway

Europe
Amsterdam Schiphol Airport via the Thalys and Nederlandse Spoorwegen (Dutch Railways)
Athens Eleftherios Venizelos Airport via the Proastiakos suburban railway service
Barcelona International Airport via RENFE commuter train and by Metro line 9 South
Belfast George Best Belfast City Airport via Belfast-Bangor Line run by Northern Ireland Railways.
Berlin Brandenburg Airport via regional, InterCity, InterCityExpress and EuroCity rail (currently delayed due to airport construction issues)
Birmingham Airport via Arriva Trains Wales, CrossCountry, Virgin Trains West Coast and West Midlands Trains.
Brussels Airport via National Railway Company of Belgium
Budapest Ferihegy International Airport by MÁV (to and from the now defunct Terminal 1 only)
Cologne Bonn Airport via ICE high-speed, regional and local trains.
Copenhagen Airport via Kystbanen and InterCity services; direct trains to many cities in Denmark and Sweden.
Düsseldorf Airport via ICE high-speed, InterCity, regional and local trains.
Frankfurt International Airport via ICE high-speed, InterCity, S-Bahn, regional and local trains.
Friedrichshafen Airport near Lake Constance by regional train.
Geneva-Cointrin Airport via Swiss Federal Railways
Glasgow, Prestwick International Airport via the Ayrshire Coast Line.
Helsinki Airport via Helsinki commuter rail via the Ring Rail Line.
Kazan International Airport via Aeroexpress to Kazan–Passazhirskaya.
Kerry Airport via Mallow-Tralee line from Farranfore run by Irish Rail.
Krakow Airport to/from city centre via local trains
Leipzig/Halle Airport via local and InterCity trains.
London
Heathrow Airport via Heathrow Express and Heathrow Connect.
Gatwick Airport via Gatwick Express and other Brighton Main Line services.
Stansted Airport via Stansted Express, Abellio Greater Anglia and CrossCountry.
Southend Airport via Abellio Greater Anglia service.
Lyon airport via TGV.
Lübeck, Lübeck Airport non-stop via regional trains.
Manchester Airport (Northern, TransPennine Express, Arriva Trains Wales).
Málaga Airport via Cercanías Málaga service.
Milan Malpensa International Airport via Malpensa Express.
Moscow. Trains operated by Aeroexpress company to the city’s three main airports:
Domodedovo International Airport
Vnukovo Airport
Sheremetyevo International Airport
Oslo Airport, Gardermoen via the Airport Express Train and InterCity trains.
Paris Charles de Gaulle Airport via TGV to many French cities
Palermo Airport via local trains
Pisa Galileo Galilei International Airport: connections to Pisa’s central station and Florence
Rome Leonardo Da Vinci International Airport via Leonardo Express, the station is also served by the regional service FL1
Sochi International Airport via Aeroexpress
Sofia Airport via Sofia Metro
Southampton Airport by CrossCountry and South Western Railway
Stockholm Arlanda Airport via Arlanda Express service, InterCity, Regional and local commuter train services.
Strasbourg Airport via TER Alsace regional trains
Turin Caselle Airport via Ferrovia Torino-Ceres
Vienna International Airport via City Airport Train (CAT)
Vilnius International Airport via Lithuanian Railways
Szczecin “Solidarity” Szczecin–Goleniów Airport via Przewozy Regionalne
Warsaw Frederic Chopin Airport via Szybka Kolej Miejska (Warsaw).
And new Modlin Airport being built for no-frills airlines (rail to be opened later)[needs update]
Trondheim Airport, Norway, via regional trains on the Nordland Line.
Zürich Airport via Swiss Federal Railways

North America
Anchorage International Airport via Alaska Railroad (Service available to cruise passengers only)
Bob Hope Airport (Los Angeles area) via Metrolink and Amtrak
Denver International Airport via Regional Transportation District A-Line
Philadelphia International Airport via SEPTA Regional Rail
Providence T.F. Green Airport via MBTA Commuter Rail
South Bend Regional Airport via South Shore Line
Toronto Pearson International Airport via Union Pearson Express

Oceania
Brisbane Airport, Brisbane via Airtrain
Sydney Airport, Sydney via Airport, Inner West & South Line
One-seat ride via local public transport
Many cities also provide a link to their airports through their rapid transit or light rail systems, which, unlike express trains, often make numerous stops on the way to the airport. At some airports, such as O’Hare in Chicago or Hartsfield-Jackson in Atlanta, the rapid transit train only visits one terminal or concourse; passengers must transfer to an airport circulator (people mover system) to reach other terminals or concourses.

Asia
Bangkok Suvarnabhumi International Airport via Suvarnabhumi Airport City Line
Beijing Capital International Airport via Beijing Subway Airport Line
Busan Gimhae International Airport via BGLRT
Chengdu Shuangliu International Airport via Chengdu Metro Line 10
Changsha Huanghua International Airport via Changsha Maglev
Chennai International Airport via Chennai Metro Blue Line
Chongqing Jiangbei International Airport via Line 3 and Line 10
Dalian Zhoushuizi International Airport via Dalian Metro Line 2
Dubai International Airport via Dubai Metro Red Line
Fukuoka Airport domestic terminals via Fukuoka City Subway Kuko Line
Guangzhou Baiyun International Airport via Line 3
Gwangju International Airport via Gwangju Subway Line 1
İzmir Adnan Menderes Airport via Suburban Train of İzmir
Kaohsiung International Airport via Kaohsiung Mass Rapid Transit Red Line
Kolkata Netaji Subhash Chandra Bose International Airport via Kolkata Suburban Railway Airport Line EMUs (known as BimanBandar Locals)
Kobe Airport via Port Liner
Kuala Lumpur
Kuala Lumpur International Airport & KLIA2 via the KLIA Transit
Subang Airport via Skypark Link
Kunming Changshui International Airport via Line 6
Mumbai Chhatrapati Shivaji International Airport via Mumbai Metro (under construction)
Naha Airport via Okinawa Monorail
Nanjing Lukou International Airport via Line S1
New Delhi Indira Gandhi International Airport via Delhi Airport Metro Express (Orange Line of Delhi Metro)
Ningbo Lishe International Airport via Line 2, Ningbo Rail Transit
Osaka International Airport (Itami) via Osaka Monorail
Padang Minangkabau International Airport via Minangkabau ARS
Seoul Gimpo International Airport via Seoul Subway Line 5 & Line 9
Shanghai
Shanghai Hongqiao International Airport via Shanghai Metro Line 2, Line 10 and Line 17
Shanghai Pudong International Airport via Shanghai Metro Line 2
Shenyang Taoxian International Airport via Shenyang Modern Tram line 2
Shenzhen Bao’an International Airport via Shenzhen Metro Line 11
Singapore Changi Airport via SMRT Corporation’s East West MRT Line Changi Airport Branch (cross-platform interchange required to main branch of East West MRT Line at Tanah Merah MRT Station)
Taipei
Taipei Songshan Airport via Taipei Metro Neihu Line
Taiwan Taoyuan International Airport via Taoyuan International Airport MRT
Tianjin Binhai International Airport via Tianjin Metro Line 2
Tehran
Mehrabad International Airport via Tehran Metro Line 4 Mehrabad Branch (transfer required to main branch of Line 4 at Bimeh)
Tokyo Narita International Airport via JR East’s Airport Narita and Keisei Electric Railway Sky Access and Keisei Mainline
Tokyo Haneda Airport via Tokyo Monorail’s Local and Rapid services or Keihin Electric Express Railway
Yogyakarta Adisutjipto International Airport served by Prameks (Prambanan Ekspress) commuter serving Yogyakarta-Solo Balapan-Palur corridor.
Zhengzhou Xinzheng International Airport via Zhengzhou Metro Chengjiao Line.

Europe
Athens Eleftherios Venizelos Airport via the Athens Metro
Bergen Airport via Bergen Light Rail
Berlin Brandenburg Airport via Berlin S-Bahn (under construction, Berlin-Schonefeld International Airport connected until then)
Bremen Airport by Bremer Straßenbahn
Copenhagen Airport via Copenhagen Metro
Dresden Airport via Dresden S-Bahn
Edinburgh Airport via Edinburgh Trams. This links into Edinburgh Gateway station on the existing Edinburgh to Aberdeen railway line, providing mainline rail connections to the airport.
Frankfurt International Airport via Rhein-Main S-Bahn and Regional-Express.
Hamburg Airport via Hamburg S-Bahn, mass rapid transit, green line
Hannover Airport via S-Bahn
Helsinki, Helsinki-Vantaa Airport via Ring Rail Line
Istanbul Ataturk International Airport via Istanbul Metro M1
Kerry Airport via Iarnród Éireann services to Farranfore from Tralee and Mallow
Kiev International Airport via Kiev Urban Electric Train and commuter and regional trains stopping at Kiev-Volynskyi station (0.5 km away from the airport)
London:
Heathrow Airport via the London Underground’s Piccadilly line
London City Airport via the Docklands Light Railway
Lisbon Airport via Lisbon Metro
Lyon Airport via Rhônexpress
Madrid Barajas International Airport via Madrid Metro Line 8. It used to have check-in facilities in the city center terminus of the line, that has been abandoned due to high costs and low use. Also via Cercanías Madrid commuter trains by RENFE (which commenced service in 2011).
Manchester Airport via Manchester Metrolink.
Munich International Airport via Munich S-Bahn
Newcastle Airport via the Tyne and Wear Metro
Nuremberg Airport via Nuremberg U-Bahn
Oporto via Metro do Porto
Paris Charles de Gaulle Airport via RER B
Paris Orly Airport via Tramway T7
Stockholm Arlanda Airport via the Stockholm Commuter Rail
Stuttgart Airport via Stuttgart S-Bahn
Vienna International Airport via Vienna S-Bahn
Zurich Airport via Zürich trams and Stadtbahn Glattal

North America
Hartsfield-Jackson Atlanta International Airport (domestic terminal) via MARTA
Baltimore-Washington International Airport via Baltimore Light Rail
Cleveland Hopkins International Airport via Cleveland RTA Red Line
Chicago
O’Hare International Airport via Chicago ‘L’ Blue Line
Chicago Midway International Airport via Chicago ‘L’ Orange Line
Dallas-Fort Worth International Airport via DART Orange Line
Mexico City International Airport via the Mexico City Metro’s Line 5
Minneapolis-Saint Paul International Airport via the METRO Blue Line
Oakland International Airport via Bay Area Rapid Transit
Phoenix Sky Harbor International Airport via free PHX Sky Train and Valley Metro Rail
Portland International Airport via MAX Light Rail (Red Line)
Salt Lake City International Airport via TRAX (Green Line)
San Francisco International Airport via Bay Area Rapid Transit
Seattle-Tacoma International Airport via Central Link
St. Louis’ Lambert-St. Louis International Airport via the St. Louis MetroLink
Vancouver International Airport via SkyTrain Canada Line
Ronald Reagan Washington National Airport via the Washington Metro
Dulles International Airport via Washington Metro (under construction)

South America
Rio de Janeiro Santos Dumont Airport via Rio de Janeiro Light Rail
Porto Alegre Salgado Filho Airport via Porto Alegre Metro

Rail to airport people mover
A hybrid solution adopted in some cities is a direct rail connection to an airport train station instead of to the airport itself. At the airport train station, the passenger switches to a people mover or other train that goes to the airport terminals. The same system can also serve passengers moving between different terminals and traveling between the terminals and car rental lots or parking areas. Several very large airports have rail stations near some terminals, but people movers are used by many to get to some other terminals. Examples: Paris-de Gaulle and Oakland.

Asia
Bangkok Donmueang Airport via SRT Dark Red Line and Suvarnabhumi Airport Rail Link – Donmueang Extension.
Jakarta Soekarno-Hatta International Airport via Skytrain.

Europe
Paris Orly Airport via Orlyval, a people mover that connects to the RER network at Antony
Birmingham Airport via a pair of light-rail vehicles, connects the airport terminal to Birmingham International railway station, where the West Coast Main Line runs to Birmingham New Street, Coventry and London
Düsseldorf Airport via SkyTrain a short suspension railway that connects the terminals with the airport railway station (see above)

North America
John F. Kennedy International Airport in New York City via AirTrain JFK to Jamaica station (Long Island Rail Road trains and New York City Subway E, J, and Z trains) or Howard Beach – JFK Airport (A train).
Miami International Airport via an airport People Mover and Miami Central Station, which is a stop for the Miami-Dade Metrorail and Amtrak and Tri-Rail.
Newark Liberty International Airport via AirTrain Newark and its train station, a stop for Amtrak and NJ Transit (Used by United Airlines as if it were a connecting airline.)
Oakland International Airport via BART to OAK Airport, a BART Automated Guideway Transit (AGT) system between the Coliseum Station (BART and Amtrak) and Oakland International Airport (BART station) that connect to the airport terminal buildings.
Phoenix Sky Harbor International Airport via PHX Sky Train to 44th St/Washington station of the Valley Metro Rail system.
San Francisco International Airport via AirTrain SFO. While the BART station is immediately adjacent to the International terminal and all terminals are physically connected, many people transfer to AirTrain to get to other terminals because of the airport’s large size.

Rail to bus to airport
Another common arrangement requires the passenger to take a train (or metro) to a railway station (usually) near the airport and then switch to a bus that goes to the airport terminals. Most medium and large size airports have bus connections from the inner city. This list only contains connections by bus from a railway station strongly associated, by branding or by name, with the airport.

Asia

Cheongju International Airport via shuttle bus from Korail Cheongju Airport Station.
Daegu International Airport via local buses from Daegu Subway Ayanggyo Station.
Fukuoka Airport international terminal via a shuttle bus from Hakata Station.
Hualien Airport via Hualien Transportation Bus number 1123 from Hualien Station.
Hengchun Airport via Pingtung Bus number 8205 from Pingtung Station or Jialu Station or number 9188 from Kaohsiung Station and Xinzuoying Station.
Hong Kong International Airport via bus no. S1 from Tung Chung MTR Station.
Kuala Lumpur
Kuala Lumpur International Airport & KLIA2 via express shuttle bus from KL Sentral & Terminal Bersepadu Selatan-Bandar Tasik Selatan (TBS-BTS) or transit bus at Nilai commuter station.
Subang Airport via transit bus no. 772 from Pasar Seni & LRT feeder bus no. T773 from Ara Damansara.
Ninoy Aquino International Airport via shuttle bus from Taft Avenue MRT Station and Baclaran LRT Station.
Shenzhen Bao’an International Airport via bus no. M416 from Hourui Station on the Luobao Line (For current terminals)
Shijiazhuang Zhengding International Airport via shuttle bus on dedicated roadway from Zhengding Airport Railway Station on the Beijing–Guangzhou High-Speed Railway
Taichung International Airport via Taichung Bus number 9 and 69 from TRA Taichung TRA station or no. 115 from THSR Taichung Station and Xinwuri Station.
Tainan Airport via Shinan Bus number Red 3 from TRA Tainan Station, THSR Tainan Station or Bao’an Station, H31 from THSR tainan Station; Tainan City Bus number 5 also provides some part-time runs via TRA Tainan Station.

Europe

Aberdeen Airport, Scotland via Dyce railway station and 80 Dyce Airlink shuttle bus. In addition to linking the airport with Aberdeen, Dyce railway station also provides direct connections to Edinburgh, Glasgow and Inverness, as well as intermediate stations on those lines.
Bristol Airport, England, by frequent express bus from Bristol Temple Meads railway station
Bucharest’s Henri Coandă International Airport via P.O. Aeroport Station, located about 900 m from the airport, and a shuttle bus timed to offer connections with all trains (every half hour). Combo (bus plus train) tickets are sold under the ‘Henri Coanda Express’ brand.
Cardiff International Airport, Wales via Arriva Trains Wales services and a frequent shuttle bus from Cardiff International Airport Station.
Glasgow International Airport via shuttle bus from Paisley Gilmour Street railway station
Liverpool John Lennon Airport via regular shuttle bus services from Liverpool South Parkway
London Luton Airport via shuttle bus from Luton Airport Parkway railway station
Marseille Provence Airport via free shuttles to Marseille Provence Airport train station, which is used by Transport express régional trains.
Moscow Sheremetyevo, buses and minibuses from the metro station Rechnoi Vokzal and Planernaya
Moscow Domodedovo, buses and minibuses from the metro station Domodedovskaya
Moscow Vnukovo, buses and minibuses from the metro stations Yugo-Zapadnaya and Oktyabrskaya
Sandefjord Airport (and until 2016 the now closed Moss Airport) in Norway has free shuttle buses to a nearby regional railway station.
Paris Orly airport, via shuttle bus to Pont de Rungis – Aéroport d’Orly
Rotterdam The Hague Airport via shuttle bus to Meijersplein RandstadRail station
St. Petersburg Pulkovo, minibuses from the metro station Moskovskaya
Stockholm Arlanda Airport via suburban bus to Märsta Railway Station, Regional and Commuter train services (usually done to avoid the extra station entrance fee at Arlanda airport to take the commuter train from there)

North America

Albuquerque International Sunport via a shuttle bus and the Bernalillo County/International Sunport stop for New Mexico Rail Runner Express service.
Baltimore-Washington International Airport via a shuttle bus and the BWI Rail Station, a stop for Amtrak and MARC Penn Line service.
Boston’s Logan International Airport via:
The Silver Line SL1 Bus Rapid Transit service connecting at South Station with the MBTA Red Line (a free transfer), commuter rail and intercity buses.
Free MassPort shuttle buses between Logan terminals and the Airport station on the MBTA Blue Line.
Chicago O’ Hare International Airport via the Airport Transit System from Parking Lot E, a shuttle bus from O’Hare Metra station, and Metra’s North Central Service.
Dallas
Dallas-Fort Worth International Airport via two shuttle buses and the Trinity Railway Express
Dallas Love Field via a shuttle bus to DART’s Inwood/Love Field Station.
Edmonton International Airport via 747 shuttle bus to the Century Park Light Rail station.
LaGuardia Airport all terminals via MTA New York City Bus:
M60 to Astoria Boulevard (New York City Subway N and W trains), 125th Street & Lexington Avenue (4, 5, 6, and <6> trains), Harlem–125th Street (Metro-North commuter trains), 125th Street & Lenox Avenue (2 and 3 trains), 125th Street & St. Nicholas Avenue (A, B, C, and D trains) and Cathedral Parkway–110th Street (1 train).
Q48 to 111th Street (7 train), Mets–Willets Point (7 and <7> trains), Flushing–Main Street (7 and <7> trains) and Flushing–Main Street (Long Island Rail Road Port Washington Branch trains).
Additionally, the Q47, Q70, Q72 also go to selected terminals of the LaGuardia Airport.
John F. Kennedy International Airport: served by B15, Q3, Q6, Q7, Q10 bus routes.
Formerly, John F. Kennedy International Airport in New York City had a shuttle bus to the Howard Beach – JFK Airport station (A and JFK Express trains). The JFK Express trains were canceled in April 1990. The shuttle bus was replaced by AirTrain JFK in 2003.
Los Angeles International Airport via a shuttle bus and the Metro Green Line or Amtrak California or FlyAway Bus
Milwaukee’s General Mitchell International Airport via a shuttle bus and Amtrak.
Montréal–Pierre Elliott Trudeau International Airport via route 747 to the metro system at Lionel-Groulx and Berri-UQAM stations, as well as stops downtown along Boulevard Rene-Levesque.
Newburgh, NY – Stewart International Airport via the Leprechaun Lines commuter bus to Beacon station (Metro-North commuter trains) to New York City.
San Diego International Airport via Route 992 to Santa Fe Depot/America Plaza stations on the San Diego Trolley Blue and Orange Lines, or TROLLEY → TERMINAL shuttle bus to Middletown station on the San Diego Trolley Green Line
San Jose International Airport via a shuttle bus from the Santa Clara Caltrain station or VTA’s Metro/Airport Light Rail Station.
Charles M. Schulz–Sonoma County Airport via shuttle bus to Sonoma–Marin Area Rail Transit.
Toronto Pearson International Airport via Route 192 Airport Rocket bus to Line 2 Bloor–Danforth at Kipling subway station; Route 52A Lawrence West to Line 1 Yonge-University at Lawrence and Lawrence West stations; Routes 300A Bloor-Danforth to Line 2 Bloor-Danforth line and 307 Eglinton West (overnight only) to Line 1 Yonge-University at Warden and Eglinton/Eglinton West stations respectively
Toronto Billy Bishop Toronto City Airport (Toronto island) via shuttle bus to Line 1 Yonge–University and all GO Transit lines at Union Station
Washington Dulles International Airport via Washington Flyer or Dulles Flyer to the Wiehle – Reston East station (Washington Metro)

Discontinued services
Formerly, John F. Kennedy International Airport in New York City had a shuttle bus to the Howard Beach – JFK Airport station (A and JFK Express trains). The JFK Express trains were canceled in April 1990. The shuttle bus was replaced by AirTrain JFK in 2003.

South America
São Paulo-Guarulhos International Airport via Airport Bus Service from São Paulo Metro Palmeiras-Barra Funda or Portuguesa-Tiete Station.
Porto Alegre – Salgado Filho Airport via Porto Alegre Metro to Downtown Porto Alegre – São Leopoldo.
Recife – Guararapes–Gilberto Freyre Airport via Recife Metro to Downtown Recife – Camaragibe.

Oceania
Sydney, Australia:
Sydney Airport via State Transit Route 400 from Bondi Junction and Burwood.
Melbourne, Australia:
Melbourne Airport via SmartBus Route 901 from Frankston.
Melbourne Airport via Skybus Super Shuttle service from Southern Cross station.
Avalon Airport via bus shuttle service from Southern Cross station.
Auckland, New Zealand:
Auckland Airport via Route 380 (orange bus) to Onehunga Station or Papatoetoe Station.

Source from Wikipedia