Northern California TRACON (NCT) (Terminal Radar Approach Control), or NorCal TRACON for short, is an air traffic control facility that provides safety alerts, separation, and sequencing of air traffic arriving, departing, and transiting the airspace and airports in Northern California.
 Located in Rancho Cordova near Sacramento, NCT controls airspace over 19000 square miles, and serves Reno International Airport, Sacramento International Airport, San Jose International Airport, Oakland International Airport, and San Francisco International Airport, plus 19 other smaller airports with air traffic control towers.
 NCT is the 3rd busiest TRACON in America.
 NorCal TRACON is the step between local control (in an airport's control tower) and Air Route Traffic Control Center (ARTCC), in this case, Oakland Center (ICAO code: ZOA).
 San Francisco International Airport is the 2nd largest airport in California and the largest airport serving Northern California.
Charlotte Douglas International Airport (IATA: CLT, ICAO: KCLT, FAA LID: CLT) is a joint civil-military public international airport located in Charlotte, North Carolina, United States.
 Established in 1935 as Charlotte Municipal Airport, in 1954 the airport was renamed Douglas Municipal Airport after former Charlotte mayor Ben Elbert Douglas, Sr. The airport gained its current name in 1982 and, as of September 2017, it is the second largest hub for American Airlines after Dallas/Fort Worth International Airport, with service to 161 domestic and international destinations.
 As of 2016 it was the 5th busiest airport in the United States, ranked by passenger traffic and aircraft movements.
 It was also the 7th business airport in the world ranked by aircraft movements Charlotte is the largest airport in the United States without any nonstop service to Asia.
 The airport serves as a major gateway to the Caribbean Islands.
 CLT covers 5,558 acres (2,249 ha) of land.
Nội Bài International Airport (IATA: HAN, ICAO: VVNB) (Vietnamese: "Sân bay Quốc tế Nội Bài" ) in Hanoi, the capital of Vietnam, is the largest airport in Vietnam in terms of total capacity.
 It's also the second busiest airport in Vietnam after Tan Son Nhat International Airport.
 It is the main airport serving Hanoi, replacing the role of Gia Lam Airport.
 The airport consists of two passenger terminals.
 Terminal 1 serves domestic flights, and the newly-built Terminal 2 (inaugurated on 4 January 2015) serves all international flights to and from Hanoi.
 The airport is currently the main hub of the country's flag carrier Vietnam Airlines, as well as a major hub of low-cost carriers Vietjet Air and Jetstar Pacific.
Sauce Viejo is a city in the province of Santa Fe, Argentina.
 It is located about 22 km from the province's capital city, Santa Fe, and has a population of 6,825 inhabitants (2001 census ) which represents a growth of 87.96% compared to the 3,631 inhabitants (2001 census ) of the previous census.
Sauce Viejo Airport (Spanish: "Aeropuerto de Santa Fe – Sauce Viejo" ) (IATA: SFN, ICAO: SAAV) is an airport in Santa Fe Province, Argentina serving the city of Santa Fe.
 It is served by Austral Líneas Aéreas.
Cielos del Sur S.A., operating as Austral Líneas Aéreas, more commonly known by its shortened name Austral, is a domestic airline of Argentina, the sister company of Aerolíneas Argentinas.
 It is the second largest domestic scheduled airline in the country, after Aerolíneas Argentinas itself.
 As a subsidiary of Aerolíneas Argentinas, the company shares its headquarters with that airline, which is located in the Aeroparque Jorge Newbery of Buenos Aires, the main base of operations of the company.
Xi'an Xianyang International Airport (IATA: XIY, ICAO: ZLXY) is the main airport serving Xi'an, capital of China's Shaanxi Province, as well as the whole Guanzhong area.
 Covering an area of 5 km2 , it is the largest airport in Northwest China, and the second largest airport in Northern China.
 The airport was the hub for China Northwest Airlines until the company was merged into China Eastern Airlines in 2002.
 Xi'an Airport is also the hub for Joy Air and a focus city for Hainan Airlines.
Coimbatore International Airport (IATA: CJB, ICAO: VOCB) is the primary airport serving the city of Coimbatore in Tamil Nadu.
 It is located at Peelamedu, about 13 km from the center of the city.
 Previously known as Peelamedu Civil Aerodrome, it is the 19th busiest airport in India in terms of passengers handled, 16th busiest in terms of total aircraft movement and 14th busiest in terms of cargo handled.
 The airport is the second largest airport in terms of passenger traffic and cargo after Chennai International Airport In Tamil Nadu.
 About five domestic and three international airlines serve the airport.
 The Airport also serves as a growing hub for Cargo transportation.
Cincinnati Municipal Airport – Lunken Field (Cincinnati Municipal Lunken Airport) (IATA: LUK, ICAO: KLUK, FAA LID: LUK) is a public airport in Cincinnati, Ohio, three miles (5 km) southeast of Downtown Cincinnati.
 It is owned by the city of Cincinnati and serves private aircraft and the fleets of local corporations.
 It serves a few commercial flights and is the second largest airport serving Cincinnati after Cincinnati/Northern Kentucky International Airport.
 It is known as Lunken Airport or Lunken Field, after Eshelby Lunken.
 It is bounded by US Route 50 (historic Columbia Parkway and Eastern Avenue) to the west, US Route 52 (Kellogg Avenue) and the Ohio River to the south, the Little Miami River (which originally flowed through the airfield but was diverted) to the east, and Ohio Route 125 (Beechmont Avenue) to the north.
 The airport is headquarters and hub for Cincinnati-based public charter airline Ultimate Air Shuttle, serving 5 destinations in the eastern United States with 16 peak daily flights.
 Lunken is also home to small charter airline Flamingo Air and its aviation school.
Luleå Airport (IATA: LLA, ICAO: ESPA) is located about 7 km south-southeast of Luleå, Sweden, near the village of Kallax.
 The airport had a total of 1,177,443 passengers in 2015, and is thus Sweden's fifth largest airport.
 It is the largest airport in northern Sweden (Norrland).
 The runway is also used by the F 21 Luleå air force base.

Question: Which is the largest airport which serves Sauce Viejo Airport?
Answer: Aerolíneas Argentinas