San Francisco International Airport

The earliest scheduled carriers at the airport included Western Air Express, Maddux Air Lines, and Century Pacific Lines.[10] United Airlines was formed in 1934 and quickly became the key carrier at the airport, with Douglas DC-3 service to Los Angeles and New York beginning in January 1937. A new passenger terminal opened in 1937, constructed with Public Works Administration funding.[10] The March 1939 Official Aviation Guide shows 18 airline departures on weekdays—seventeen United flights and one TWA flight. The August 1952 chart shows runway 1L 7,000 feet long, 1R 7,750 feet, 28L 6,500 feet, and 28R 8,870 feet.

In addition to United, Pacific Seaboard Air Lines was operating service between San Francisco and Los Angeles in 1933 with Bellanca CH-300 prop aircraft on a coastal routing of San Francisco – San Jose – Salinas – Monterey – Paso Robles – San Luis Obispo – Santa Maria – Santa Barbara – Los Angeles.[12] Competition with United led Pacific Seaboard to move all of its operations to the eastern U.S., and rename itself Chicago and Southern Air Lines (C&S). It became a large domestic and international air carrier. Chicago & Southern was acquired by and merged into Delta Air Lines in 1953 thus providing Delta with its first international routes.[13] Delta used the route authority inherited from C&S to fly one of its first international services operated with Convair 880 jet aircraft from San Francisco to Montego Bay, Jamaica and Caracas, Venezuela via intermediate stops in Dallas and New Orleans in 1962.[14]

During World War II the airport was used as a Coast Guard base and Army Air Corps training and staging base. The base was called Naval Auxiliary Air Facility Mills Field and Coast Guard Air Station, San Francisco.[15] Pan American World Airways (Pan Am), which previously operated international flying boat service from Treasure Island, was forced to relocate its Pacific and Alaska seaplane operations to SFO in 1944 after Treasure Island was expropriated for use as a military base. Pan Am began commercial service from SFO in the wake of World War II with five weekly flights to Honolulu, one of which continued to Canton Island, Fiji, New Caledonia, and Auckland.

Qantas and United planes at SFO, 2018

The first international service by foreign carriers was jointly operated by Australian National Airways (ANA) and British Commonwealth Pacific Airlines (BCPA) with Douglas DC-4 propliners flying a routing of Sydney – Auckland – Fiji – Kanton Island – Honolulu – San Francisco – Vancouver, BC with the inaugural flight departing from Australia on September 15, 1946.[16] By 1947, the airport had become a stop on Pan American World Airways "round the world" service serving Guam, Japan, the Philippines, China and other countries with Pan Am also serving Sydney from SFO at this time.[17] United Airlines Douglas DC-6 propliners flying to and from Hawaii used the Pan Am terminal beginning in 1947. Philippine Airlines also began trans-Pacific service to SFO in the late 1940s.[10]

TWA began flying nonstop to Europe with Lockheed Constellations (L-1649s) in 1957. In 1959 Qantas had taken over the ANA/BCPA route from SFO to Sydney and was operating Boeing 707 service to Australia via Honolulu and Nadi, Fiji.[18] Pan Am attempted to operate Boeing 707-320s from Tokyo nonstop to SFO in winter 1960–61 (the westbound nonstops had to await the longer range Boeing 707-320B due to the prevailing winds). Also in 1960, British Overseas Airways Corporation (BOAC, a predecessor of British Airways) was serving the airport with Bristol Britannias that flew London – New York City – San Francisco – Honolulu – Wake Island – Tokyo – Hong Kong on the airline's around-the-world service.[19] By 1961 BOAC had replaced the Britannias with Boeing 707s, which enabled the airline to eliminate the fuel stop at the Wake Island Airfield.[20] By 1961 Japan Airlines (JAL) was flying Douglas DC-8s San Francisco – Honolulu – Tokyo.[21] Also in 1961, Lufthansa had begun serving SFO with Boeing 707s flying San Francisco – Montreal Dorval Airport – Paris Orly Airport – Frankfurt three days a week.[22] Lufthansa then operated Boeing 720B jets on this routing in 1963 and was also flying Boeing 707 service to Frankfurt via Montreal and London Heathrow Airport the same year.[23] By 1965 Pan American-Grace Airways, known as Panagra, was flying Douglas DC-8s San Francisco – Los Angeles – Panama City, Panama – Lima, Peru – Santiago, Chile – Buenos Aires, Argentina.[24] The Panagra service to Latin America was taken over in the late 1960s by Braniff International, which operated Douglas DC-8-62s to SFO after Braniff's acquisition of Panagra.[25] By 1970, CP Air (formerly Canadian Pacific Air Lines) was flying Boeing 737-200s nonstop to Vancouver, BC and on to Winnipeg, Toronto, Ottawa and Montreal.[26]

Opening gala at the Central Passenger Terminal (August 27, 1954)

The first nonstops to the U.S. east coast were United Douglas DC-7s in 1954. The airport's new Terminal Building opened on August 27, 1954. The large display of aircraft including a Convair B-36 Peacemaker bomber, a marvel for its time.[27][28] The building became the Central Terminal with the addition of the South Terminal and the North Terminal and was heavily rebuilt as the International Terminal in 1984 and then modified again as the current Terminal 2. Domestically, the April 1957 Official Airline Guide (OAG) lists 71 scheduled weekday departures on United (plus ten flights a week to Honolulu), 22 on Western Airlines, 19 on Southwest Airways (which was later renamed Pacific Air Lines), 12 on Trans World Airlines (TWA), seven on American Airlines and three on Pacific Southwest Airlines (PSA). As for international flights, Pan American had 21 departures a week, Japan Airlines (JAL) had five, and Qantas also had five.

Southwest Airways C-47 landing at SFO in 1948

Southwest Airways began flying scheduled passenger operations from SFO in 1946 with war surplus C-47s, the military version of the Douglas DC-3. In the late 1950s, Southwest Airways changed its name to Pacific Air Lines, which was based at SFO.[29]

In 1959 Pacific Air Lines began flying new Fairchild F-27s from SFO[30] and by 1966 was flying new Boeing 727-100s from the airport.[31] Pacific used the 727 to introduce the first jet service from San Francisco to several cities in California including Bakersfield, Eureka/Arcata, Fresno, Lake Tahoe, Monterey and Santa Barbara.

In 1968 Pacific merged with Bonanza Air Lines and West Coast Airlines to form Air West, which also had its headquarters at SFO. West Coast Airlines had served SFO mainly with Douglas DC-9-10s and Fairchild F-27s to Oregon and Washington state.[32] In 1970, Air West was acquired by Howard Hughes who renamed the airline Hughes Airwest, which continued to be based at the airport where it also operated a hub. By the late 1970s, the airline was operating an all-jet fleet of Boeing 727-200, Douglas DC-9-10 and McDonnell Douglas DC-9-30 jetliners serving an extensive route network in the western U.S. with flights to Mexico and western Canada as well.[33] Hughes Airwest was eventually acquired by Minneapolis-based Republic Airlines (1979–1986) in 1980 and the airline's headquarters office at SFO was closed.

The jet age arrived at SFO in March 1959 when TWA introduced Boeing 707-131s nonstop to New York Idlewild Airport (which was renamed JFK Airport in 1963). United then constructed a large maintenance facility at San Francisco for its new Douglas DC-8s, which were also flying nonstop to New York. In July 1959 the first jetway bridge was installed at SFO, one of the first in the United States. The cover of the January 3, 1960 American Airlines timetable contained this message: "NOW! 707 JET FLAGSHIP SERVICE – NONSTOP SAN FRANCISCO – NEW YORK: 2 FLIGHTS DAILY"[34] Also in 1960, Western Airlines was operating "champagne flights" with Boeing 707s and Lockheed L-188 Electras to Los Angeles, Seattle, San Diego and Portland, OR.[35]

In 1961 the airport had helicopter service on San Francisco and Oakland Helicopter Airlines (known as SFO Helicopter Airlines, and as SFO Helicopter) with 68 flights a day. Helicopters flew from SFO to downtown heliports in San Francisco and Oakland, to a new heliport near the Berkeley Marina and to Oakland Airport (OAK). In its timetable, SFO Helicopter Airlines, which was based at the airport, described its rotorcraft as "modern, jet turbine powered Sikorsky S-62 ten passenger amphibious helicopters".[36][37]

By 1962 Delta Air Lines was flying Convair 880s to SFO on one its first international jet services, San Francisco – Dallas Love Field – New Orleans – Montego Bay, Jamaica – Caracas, Venezuela.[14] Also in 1962, National Airlines began flying Douglas DC-8s San Francisco – Houston Hobby Airport – New Orleans – Miami.[38]

By 1960 all Pacific Southwest Airlines (PSA) flights out of SFO were operated with Lockheed L-188 Electras nonstop to Los Angeles (LAX) and Burbank (BUR, now Bob Hope Airport) with some flights continuing to San Diego.[39] In summer 1962 PSA had 14 departures a day Monday through Thursday to southern California, 21 departures on Friday and 22 on Sunday. In 1965 PSA was operating new Boeing 727-100s which were joined in 1967 by Boeing 727-200s and McDonnell Douglas DC-9-30s.[40] In 1974 PSA was flying two wide body Lockheed L-1011 TriStars.[40] After the Airline Deregulation Act of 1978, PSA expanded outside of California.

In 1967 another intrastate airline joined PSA at SFO: Air California, flying Lockheed L-188 Electras nonstop to Orange County Airport (SNA, now John Wayne Airport). Like PSA, Air California (later renamed AirCal) eventually became an all-jet airline and expanded outside of California. AirCal was merged into American Airlines while PSA was merged into USAir (later renamed US Airways which in turn eventually merged with American Airlines).

San Francisco International Airport at night

The airport closed following the Loma Prieta earthquake on October 17, 1989, reopening the following morning.[41] Minor damage to the runways was quickly repaired.[42]

In 1989, a master plan and Environmental Impact Report were prepared to guide development over the next two decades.[43] During the boom of the 1990s and the dot-com boom SFO became the sixth busiest airport in the world, but since 2001, when the boom ended, SFO has fallen out of the top 20.[44] United Express turboprops were scheduled 60 minutes apart to shuttle connecting passengers between SFO and nearby San Jose International Airport during the boom era. United Groundlink supplemented this service with alternate 60-minute frequencies.

San Francisco International Terminal at night

A $2.4 billion International Terminal Complex opened in December 2000, replacing Terminal 2 (known then as the International Terminal).[28] The new International Terminal includes the San Francisco Airport Commission Aviation Museum and Library and the Louis A. Turpen Aviation Museum, as part of the SFO Museum.[45] SFO's long-running museum exhibition program, now called SFO Museum, won unprecedented accreditation by the American Alliance of Museums in 1999.[46]

SFO experiences delays (known as flow control) in overcast weather when only two of the airport's four runways can be used at a time because the centerlines of the parallel runway sets (01R/01L and 28R/28L) are only 750 feet (230 m) apart. Airport planners advanced proposals that would extend the airport's runways by adding up to 2 square miles (1,300 acres; 520 ha) of fill to San Francisco Bay and increase their separation by up to 4,300 feet (1,300 m) in 1998 to accommodate arrivals and departures during periods of low visibility. Other proposals included three floating runways, each approximately 12,000 feet (3,700 m) long and 1,000 feet (300 m) wide.[47] The airport would be required by law to restore Bay land elsewhere in the Bay Area to offset the fill. One mitigation proposal would have the airport purchase and restore the 29,000 acres (12,000 ha) of South Bay wetlands owned by Cargill Salt to compensate for the new fill.[48][49] These expansion proposals met resistance from environmental groups, including the Sierra Club, fearing damage to the habitat of animals near the airport, recreational degradation (such as windsurfing) and bay water quality.[48][50]

State Senator John L. Burton introduced SB 1562 on February 18, 2000 to bypass the environmental impact study that would normally be required for a large project like the proposed Bay fill and mitigation in order to expedite construction. SB 1562 was signed into law on September 29, 2000.[51][52] A study commissioned by the airport and released in 2001 stated that alternatives to airport expansion, such as redirecting traffic to other regional airports (Oakland or San Jose), capping the number of flights, or charging higher landing fees at selected times of the day 2001 would result in higher fares and poorer service.[53] However, the proposal to build new runways on Bay fill continued to attract opposition from environmental groups and local residents.[54] The airport expansion cost was estimated at US$1,400,000,000 (equivalent to $2,200,000,000 in 2019) in 1998,[55] rising to US$2,200,000,000 (equivalent to $3,380,000,000 in 2019) a year later, including an estimate of US$200,000,000 (equivalent to $307,000,000 in 2019) for the Cargill wetlands purchase and restoration.[56]

The delays during poor weather (among other reasons) caused some airlines, especially low-cost carriers such as Southwest Airlines, to shift all of their service from the airport to Oakland and San Jose. However, Southwest eventually returned to SFO in 2007.[57]

A long-planned extension of the Bay Area Rapid Transit (BART) system to the airport opened on June 22, 2003, allowing passengers to board BART trains at the international or domestic terminals and have direct rail transportation to downtown San Francisco, Oakland, and the East Bay.[58] On February 24, 2003, the AirTrain people mover opened, transporting passengers between terminals, parking lots, the BART station, and the rental car center on small automatic trains.

SFO became the base of operations for start-up airline Virgin America, with service to over 20 destinations. On October 4, 2007, an Airbus A380 jumbo jet made its first visit to SFO.[59] On July 14, 2008 SFO was voted Best International Airport in North America for 2008 in the World Airports Survey by Skytrax.[60] The following year on June 9, Skytrax announced SFO as the second-best International Airport in North America in the 2009 World Airports Survey, losing to Dallas/Fort Worth International Airport.[61]

New control tower (photographed in 2018)

In response to longstanding FAA concerns that the airport's air traffic control tower, located atop Terminal 2, could not withstand a major earthquake, on July 9, 2012, crews broke ground for a new torch-shaped tower.[62] The new tower is located between Terminals 1 and 2, and the base of the tower building contains passages between the two terminals for passengers both pre- and post-security screening, which dictated the narrow tower base.[63] Originally scheduled for completion in the summer of 2016 at a cost of $102 million, the new tower began operations on October 15, 2016.[64]

SFO was one of several US airports that operated the Registered Traveler program from April 2007 until funding ended in June 2009. This program let travelers who had paid for pre-screening pass through security checkpoints quickly.[65][66] Baggage and passenger screening is operated by Covenant Aviation Security, a Transportation Security Administration contractor, nicknamed "Team SFO". SFO was the first airport in the United States to integrate in-line baggage screening into its baggage handling system and has been a model for other airports since the September 11 attacks in 2001.

In September 2018, SFO announced plans to use sustainable fuels after signing an agreement with fuel suppliers, airlines, and agencies.[67] As part of the agreement, Shell and SkyNRG began supplying sustainable aviation fuel to KLM, SAS, and Finnair flights operating out of SFO.[68][69]

Airside connector between International Terminal and Terminal 3

There exist two airside connectors at SFO that enable passengers to roam (post-security) between adjacent terminal buildings. A short airside connector links T3's Boarding Area F (adjacent to Amex Centurion Lounge) to the International Terminal Boarding Area G.[80] An airy 500-foot[81] airside connector links T1's Boarding Area C to T2.[82]

There are no airside connectors between: T1 and International Boarding Area A; T2 and T3; International Boarding Areas A and G (the main terminal area of the International Terminal separates the two boarding areas). By approximately 2020 to 2022, the demolition and rebuild of the southern portion of T1 (Boarding Area B) will have been completed and an airside connector to International Boarding Area A will be added.[83] By 2022, new airside and landside connectors and an office building will be constructed between Terminals 2 and 3.[84] By 2024, renovation of Boarding Area C will add an airside connection between it and the rest of renovated Terminal 1.[85] This means that all gates at the airport will be connected post-security.

Artwork memorializing gay rights activist and former San Francisco supervisor Harvey Milk (1930–1978)

Harvey Milk Terminal 1 Community Day, July 2019

Formerly known as the "South Terminal", Harvey Milk Terminal 1[86] is composed of Boarding Area B, which currently has 18 gates (gates B6-B9, B12-B14, B17, B18, and B19-B27). Prior to June 23, 2020, Boarding Area C was also considered part of Terminal 1. A third boarding area, Rotunda A, was demolished in early 2006, as its functions had been taken over by the new International Terminal.

The South Terminal, which cost US$14,000,000 (equivalent to $116,920,000 in 2019),[87] was initially dedicated on September 15, 1963.[88] The terminal was designed by Welton Becket and Associates.[89] When it opened, the South Terminal had three piers: Pier G (for international flights, approximately at the same location as the present-day Boarding Area (B/A) A in the International Terminal), Pier F/FF (used by Trans World Airlines (TWA) and Western Airlines, later renamed B/A B), and Pier E (used by American Airlines; originally part of Terminal 2, approximately at the present-day B/A C).[90] The three-level Rotunda A addition was completed in 1974 at the end of Pier G.[91][92][93] When the North Terminal was completed in 1979, Pier G was renamed Pier A, with the other piers renamed in a counterclockwise direction proceeding from the new Pier A.[79] International flights were moved to the rebuilt Central Terminal (Terminal 2) in 1983, and then to the new International Terminal in 2000.

The South Terminal underwent a US$150,000,000 (equivalent to $324,270,000 in 2019) renovation designed by Howard A. Friedman and Associates,[94] Marquis Associates and Wong & Brocchini[95] that was completed in 1988. Terminal 1 is undergoing a US$2,400,000,000 (equivalent to $2,556,740,000 in 2019) project to modernize the concourse and add gates;[96] the project broke ground on June 29, 2016. The phase of the project to expand Boarding Area B includes the demolition of the old TWA hangar, the demolition of the two rotundas, and the relocation of two taxiways.[90] The multi-phase project will yield a total of 24 gates when complete in 2020 (the existing Boarding Area B has fewer than 20 usable gates), including a secure Federal Inspection Services (FIS) connector to the existing customs facilities in the International Terminal.[97] This will effectively add six new gates that can handle international arrivals. Planning for a renovation of Boarding Area C is underway, with construction to commence after the completion of work on Boarding Area B. The projected completion date for Boarding Area C work is mid-2024.[90]

In April 2018, the San Francisco Board of Supervisors and mayor Mark Farrell approved and signed legislation renaming Terminal 1 after deceased gay rights activist and former member of the San Francisco Board of Supervisors Harvey Milk, and planned to install artwork memorializing him. This followed a previous attempt to rename the entire airport after him, which was turned down.[98][99] Following the art and photo installation, the renamed terminal was opened to the media and public for preview tours in advance of its official opening on July 23, 2019.[86] Harvey Milk Terminal 1 is the world's first airport terminal named after a leader of the LGBTQ community.[86]

The first nine gates at the newly reconstructed Boarding Area B opened on July 23, 2019, with Southwest Airlines and JetBlue becoming the first tenants. JetBlue operates two gates preferentially (B6 and B7) and shares one with Southwest (B8), while Southwest operates five gates preferentially (B9, B12-B14, and B17).[100] In late-April 2020, the terminal's new lobby opened, with new ticket counters for Southwest and JetBlue, and a new permanent exhibit honoring Milk.[101][102] On May 12, 2020, in conjunction with the launch of nine new gates at Boarding Area B (B19-B27), American Airlines moved into the new facility, with new ticket counters, baggage systems, and a new Admirals Club lounge. American operates six of the nine new gates preferentially (B22-B27).[103][104] Frontier Airlines, Hawaiian Airlines, and Sun Country Airlines are scheduled to move in by 2023.[100]

Interior of Terminal 2, with Janet Echelman's Every Beating Second installation

Formerly known as the "Central Terminal," Terminal 2 is composed of Boarding Area C, which has 10 gates (gates C2-C11), and Boarding Area D, which has 15 gates (D1-D12 and D14-D16). The D gates is where Alaska Airlines has their hub. Gate D13 does not exist as the number has been reserved for future development.[105]

Terminal 2 opened in 1954 as the main airport terminal. After a drastic rebuilding designed by Gensler, it replaced Rotunda A as SFO's international terminal in 1983[106][107] until it was closed for renovation after the current international terminal opened in 2000. The initial plan was to convert Terminal 2 for domestic travel and reopen it by fall 2001, but the loss of passenger traffic after the terrorist attacks of September 11, 2001 put those plans on hold. The upper levels continued to be used as office spaces and for the airport's medical clinic, and the control tower remained in use.[108]

On May 12, 2008, a US$383,000,000 (equivalent to $454,810,000 in 2019) renovation project was announced that included a new control tower, the use of green materials, a seismic retrofit, and an expansion from ten to fourteen gates.[108][109] The terminal reopened for commercial travel on April 14, 2011, with Virgin America (later Alaska Airlines) and American Airlines sharing the new 14-gate common-use facility.[110] Approximately a week earlier, on April 6, 2011, Virgin America's ceremonial flight VX2001 was the first to arrive at the renovated Terminal 2, an Airbus A320 bearing founder Richard Branson with other invited celebrity guests, such as Buzz Aldrin, Rachel Hunter, and Gavin Newsom. VX2001 had rendezvoused with White Knight Two/SpaceShipTwo over Point Reyes before making a side-by-side landing.[111]

View of Boarding Area D in Terminal 2

The newly renovated terminal also designed by Gensler features permanent art installations from Janet Echelman, Kendall Buster, Norie Sato, Charles Sowers, and Walter Kitundu.[106][112][113] Transition zones (the immediate post-security line area for "passenger recomposure") and exit areas (where disembarking passengers may be greeted) were designed with generous space.[114][115] Terminal 2 set accolades by being the first U.S. airport to achieve LEED Gold status.[116] Paolo Lucchesi, a local food critic, noted the sustainable food and dining program featuring local vendors and sources.[117][118]

Following the construction of a new control tower in 2016, the tower and the offices above the terminal were demolished and a new office space was constructed in their place. On February 14, 2020, a new public, outdoor observation deck, called SkyTerrace, was opened in the new office space.[119]

Until May 12, 2020, American's check-in counters were consolidated to T2, but its operations were split between Boarding Area D and Boarding Area C (linked via an airside connector). Following American's move to T1, the existing Admirals Club location is scheduled to be repurposed as retail and dining space for T2. A new Alaska lounge was set to open in 2020 but is on hold due to the COVID-19 pandemic.[103][120]

As of June 23, 2020, SFO advertises Boarding Area C as part of Terminal 2 due to construction.[121] During the construction of Boarding Area B, Boarding Area C continues to operate, with Delta Air Lines operating as the main tenant.

Terminal 3 interior

Formerly known as the "North Terminal", Terminal 3 has Boarding Area E with 13 gates (gates E1-E13) and Boarding Area F with 23 gates (gates F1-F3, F3A, F4-F22). Terminal 3 is used for United Airlines' domestic flights. Mainline United flights use both boarding areas, while United Express regional flights use Boarding Area F.[122]

This $82.44 million terminal was originally designed by San Francisco Airport Architects (a joint venture of John Carl Warnecke and Associates, Dreyfuss + Blackford Architecture, and minority architects).[123] The groundbreaking ceremony for the North Terminal was held on April 22, 1971,[124] and Boarding Area F opened in 1979 and Boarding Area E opened in 1981.[125] All terminals (except the International Terminal) were redesignated by number starting October 1, 2001.[126]

A solar roof was installed in 2007 with sufficient generating capacity to power all Terminal 3 lights during the day.[127] American Airlines[128] and Air Canada[129] occupied Boarding Area E until it closed for refurbishment in 2011 under the airport's FY 2010/11 – FY 2014/15 Capital Plan. Designed by Gensler, the renovation. included architectural enhancements, structural renovations, replacement of HVAC systems, roof repair, and new carpeting.[130] Initial modest renovation plans were replaced by a more ambitious project after the popularity of the remodeling of Terminal 2.[131] After the completion of the US$138,000,000 (equivalent to $149,040,000 in 2019) project, Boarding Area E reopened on January 28, 2014, followed by Terminal 3 East on November 18, 2014[132][133][134] The project moved one gate from Boarding Area F to Boarding Area E to provide a total of ten aircraft parking positions at T3E.[135] Following a 2019 renumbering of all gates at SFO, three additional gates moved from Boarding Area F to Boarding Area E, with the latter now containing 13 gates.[105]

There are three United Clubs in Terminal 3—one near the rotunda for Boarding Area F, one on the mezzanine across from gate E2, and another at the beginning of Boarding Area E. Terminal 3 also houses the American Express Centurion Lounge, located across from Gate F2.

The International Terminal

The International Terminal is composed of Boarding Areas A and G. Designed by Craig W. Hartman of Skidmore, Owings and Merrill, the terminal opened in December 2000 to replace the International Departures section of Terminal 2. It is the largest international terminal in North America, and the largest building in the world built on base isolators to protect against earthquakes.[136] Food service focuses on quick service versions of leading San Francisco Bay Area restaurants, following other SFO terminals. Planners attempted to make the airport a destination in and of itself, not just for travelers passing through.[137] The international terminal is a common-use facility, with all gates and all ticketing areas shared among international airlines and several domestic carriers. Common-use terminal equipment (CUTE) is used at check-in counters and gates.[138] All international arrivals and departures are handled here (except flights from cities with customs preclearance). The International Terminal houses the airport's BART station, adjacent to the garage leading to Boarding Area G. The SFO Medical Clinic is located next to the security screening area of Boarding Area A. All gates in this terminal have at least two jetway bridges, except gates A3 and A12, which have one. Gates A1 and A2 can accommodate two aircraft. Six of the gates are designed for the Airbus A380, making SFO one of the first airports in the world with such gates when it was built in 2000.[139] Gate A11 has three jetways for boarding.[140] Four other gates have two jetways fitted for A380 service.[140]

The International Terminal completed a continuous ring of terminals, by filling in the last remaining gap to the west of then-existing terminals. Its geometry required that the terminal structure be built above the main access road, at enormous expense, including building dedicated ramps for connectivity to Highway 101. The design and construction of the international terminal was by Skidmore, Owings & Merrill, Del Campo & Maru Architects, Michael Willis Associates, and built by Tutor Perini (main terminal building), Hellmuth, Obata, and Kassabaum in association with Robin Chiang & Company, Robert B. Wong Architects, and built by Tutor Perini (Boarding Area G), and Gerson/Overstreet Architects and built by Hensel Phelps Construction (Boarding Area A).[136] The contracts were awarded after an architectural design competition.

Interior of the International Terminal check-in area

Most international flights operated by Star Alliance carriers, including all United international flights and select United domestic flights, are assigned to Boarding Area G's 14 gates (G1-G14).[141] Most international flights operated by SkyTeam, Oneworld, and non-aligned international carriers board and deplane at Boarding Area A's 15 gates (gates A1–A15). However, Star Alliance carrier Avianca El Salvador operates out of Boarding Area A, and non-aligned carriers Aer Lingus, Fiji Airways, and WestJet typically park at Boarding Area G. Boarding Area A is also used by domestic carriers Frontier Airlines, Sun Country Airlines, and Hawaiian Airlines. When all gates in an airline's designated international boarding area are full, the passengers will board or deplane from the opposite international boarding area. Air Canada, Aer Lingus, and WestJet operate from airports with United States border preclearance, allowing arriving passengers to skip the wait at customs and immigration when they arrive at SFO, and exit the airport from the departure level.

The two main designations for the International Terminal are "I", and "INTL" (abbreviations for "International"). Oftentimes travel itineraries will say "T-I", and this has led to instances where passengers misinterpret the "I" as Terminal 1, especially since both Boarding Area A and Boarding Area G are used for a limited number of domestic flights.

See source Wikidata query.

Traffic by calendar year[1]

Year	Rank	Enplaned and deplaned passengers	Change	Aircraft movements	Cargo (tonnes)
1998		40,101,387		432,046	598,579
1999		40,387,538	0.7%	438,685	655,409
2000	9	41,048,996	1.8%	429,222	695,258
2001	14	34,632,474	15.6%	387,594	517,124
2002	19	31,450,168	9.2%	351,453	506,083
2003	22	29,313,271	6.8%	334,515	483,413
2004	21	32,744,186	8.8%	353,231	489,776
2005	23	33,394,225	2.0%	352,871	520,386
2006	26	33,581,412	0.5%	359,201	529,303
2007	23	35,790,746	6.6%	379,500	503,899
2008	21	37,402,541	4.5%	387,710	429,912
2009	20	37,453,634	0.1%	379,751	356,266
2010	23	39,391,234	5.2%	387,248	384,179
2011	22	41,045,431	4.2%	403,564	340,766
2012	22	44,477,209	8.4%	424,566	337,357
2013	22	44,944,201	1.2%	421,400	325,782
2014	21	47,074,162	4.9%	431,633	349,585
2015	15	50,067,094	6.2%	429,815	389,934
2016	23	53,106,505	6.1%	450,388	420,086
2017	24	55,832,518	5.1%	460,343	491,162
2018	25	57,793,313	3.5%	470,164	500,081
2019	24	57,488,023	0.5%	458,496	546,437
2020	N/A	16,427,801	71.4%	231,163	439,358

AirTrain is the airport's landside people-mover system. Fully automated and free of charge, it connects all four terminals, the two international terminal garages, the BART station, the Grand Hyatt, and the airport's Rental Car Center. An extension to the Long-Term Parking is currently underway.[210][211]

The San Francisco International Airport (SFO) BART station, located in Parking Garage G of the International Terminal, is the only direct rail link between the airport, the city of San Francisco, and the general Bay Area. The SFO station is served by the Antioch–SFO/Millbrae line and the SFO–Millbrae line.

BART is SFO's connection to Caltrain at the Millbrae Station.[212] Caltrain used to offer a free shuttle to SFO airport from the Millbrae station,[213] but it was replaced by BART service when the SFO extension was completed.

The San Francisco Municipal Railway, San Francisco's transit agency, does not provide service to the airport. However, SamTrans, San Mateo County's transit agency, does, with six lines, SFO, 140, 292, 397, 398, and 399, connecting the Airport with Downtown San Francisco, the Peninsula, and as far south as Palo Alto. In particular:

• Route SFO direct service from the Millbrae Transit Center (Caltrain and BART).
• Route 140 provides local service from the Rental Car Center (accessible via AirTrain) to San Bruno, South San Francisco, and Pacifica, stopping at San Bruno Caltrain, San Bruno BART, and Skyline College for connections within San Mateo County and beyond.
• Route 292 serves the airport daily between San Francisco and Hillsdale Mall via Bayshore Boulevard and Downtown San Mateo.
• Route 397 operates to the airport during the overnight hours as a part of the Bay Area's "All Nighter" service.[214] This service mirrors that of Route 292 north of the airport (with an additional stop at Civic Center BART/Muni Metro Station), with service continuing south via Millbrae BART/Caltrain Station and El Camino Real to and from Palo Alto Caltrain.
• Route 398 serves the airport and it runs between San Francisco and Redwood City Caltrain.
• Route 399 operates to the airport during the overnight hours as a part of the Bay Area's "All Nighter" service.[215] This service mirrors that of Routes 120, 140, and ECR north of the airport (with an additional limited stop at Daly City BART Station), serving San Bruno and South San Francisco before terminating at Mission Street and Wellington Avenue in Daly City, where passengers can connect to MUNI's All Nighter 14 Mission Route.

Samtrans can be accessed on the arrivals/baggage claim level of the domestic terminals and in courtyard A or G in the International Terminal.

Numerous door-to-door "shared ride" van and hotel courtesy shuttles stop at the center transportation island on the departure level, while airporter and limousine are on the arrivals/baggage claim level of the airport. Charter services are also available in the courtyards.

Bird's-eye view of the airport. A spaghetti junction connects the passenger terminal roads to US Route 101.

The airport is located on U.S. Route 101, 13 miles (21 km) south of downtown San Francisco. It is near the US 101 interchange with Interstate 380, a short freeway that connects US 101 with Interstate 280.

The airport provides both short-term and long-term parking facilities.

SFO with US 101 in the background

Short term parking is located in the central terminal area and two international terminal garages. Long term parking is located on South Airport Blvd. and San Bruno Ave. and are served by shuttle buses.[216]

Passengers can also park long-term at a select number of BART stations that have parking lots, with a permit purchased online in advance.[217]

Taxis depart from designated taxi zones located at the roadway center islands, on the Arrivals/Baggage Claim Level of all terminals.[218]

Ride app services such as Uber and Lyft are available via their respective mobile app. The designated ride app pickup area for domestic terminals is on the fifth floor of the adjacent garage. The designated pickup area for the International Terminal is on the Departures/Check-In Level roadway center island.

The airport provides free shuttle bus service to and from the South San Francisco Ferry Terminal.[219] These shuttle buses meet San Francisco Bay Ferry services from Alameda and Oakland.