Question: What is the main international airport where the political party of Ulf Holm is based?

full_context: Document 1: Monrad Wallgren: Wallgren, of Swedish descent, was born in Des Moines, Iowa in 1891. His family moved to Texas in 1894 and then to Everett, Washington in 1901. He attended public schools and business college in Everett, graduating from the Washington State School of Optometry in Spokane, Washington in 1914. He worked in retail jewelry and optometry from 1915 to 1932, as well as serving in the Washington National Guard from 1917 to 1919 and 1921 to 1922. He was an outstanding player of three-cushion billiards and balkline and straight rail billiards.
Document 2: Arboga Airport: Arboga Airport is an airport serving Arboga in Västmanland County, Sweden. It is a former Swedish Airforce backup base located outside of Arboga used by the Test Unit of SWAF for tests of airborne missiles. Today, the airfield is solely used by the local flying club.
Document 3: Helena Leander: Helena Leander (born 1982) is a Swedish Green Party politician. She has been a member of the Riksdag since 2006.
Document 4: Same-sex marriage in Sweden: On 27 October 2007, the Moderate Party formally backed same-sex marriages, meaning that the Christian Democrats would be the only party to oppose the law. Göran Hägglund, the leader of the Christian Democrats, stated on Swedish Radio, "my position is that I have been tasked by the party to argue that marriage is for men and women. … When we discuss it between parties we are naturally open and sensitive to each other's arguments and we'll see if we can find a line that allows us to come together."On 12 December 2007, the Church of Sweden gave the green light for same-sex couples to wed in the church, but recommended the term marriage be restricted to opposite-sex couples. It was asked by the Government for its opinion on the matter before the introduction of legislation in early 2008. "Marriage and (same-sex) partnerships are equivalent forms of unions. Therefore the Church of Sweden's central board says yes to the proposal to join the legislation for marriages and partnerships into a single law," the Church said in a statement. "According to the Church of Sweden's board the word 'marriage' should, however, only be used for the relationship between a woman and a man," it said.On 14 January 2008, two leading politicians in the Christian Democrats took a position against the party and started to support same-sex marriage.Reports suggested the Government would table its same-sex marriage bill in early 2008, however, they had yet to propose a bill. This was likely due to the Christian Democrats' opposition from within the four-party centre-right governing coalition despite their being the only party opposing the move. After negotiations on a compromise broke down and facing a parliamentary ultimatum in late October 2008,  the Government prepared to present its bill to a free vote.
Document 5: Hartsfield–Jackson Atlanta International Airport: Hartsfield -- Jackson Atlanta International Airport (IATA: ATL, ICAO: KATL, FAA LID: ATL), also known as Atlanta Airport, Hartsfield, or Hartsfield -- Jackson, is an international airport located 7 miles (11 km) south of Atlanta's central business district, in the U.S. state of Georgia. It has been the world's busiest airport by passenger traffic since 1998; and by number of landings and take - offs from 2005 to 2013, losing that title to Chicago - O'Hare in 2014, but regaining it a year later. Hartsfield -- Jackson held its ranking as the world's busiest airport in 2012, both in passengers and number of flights, by accommodating 100 million passengers (more than 260,000 passengers daily) and 950,119 flights. Many of the nearly one million flights are domestic flights from within the United States, where the airport serves as a major hub for travel throughout the southeastern region of the country. The airport has 207 domestic and international gates. ATL covers 4,700 acres (1,902 ha) of land and has five parallel runways.
Document 6: New Delhi: Indira Gandhi International Airport, situated to the southwest of Delhi, is the main gateway for the city's domestic and international civilian air traffic. In 2012-13, the airport was used by more than 35 million passengers, making it one of the busiest airports in South Asia. Terminal 3, which cost ₹96.8 billion (US$1.4 billion) to construct between 2007 and 2010, handles an additional 37 million passengers annually.
Document 7: Anders Wallner: Anders Wallner, born 1983 in Bergsjö, Hälsingland, is a Swedish Green Party member, resident in Stockholm. He was party secretary () from 2011 to 2016.
Document 8: Anders Johan von Höpken: Count Anders Johan von Höpken (31 March 1712, Stockholm9 May 1789, Stockholm), Swedish statesman, was the son of Daniel Niklas von Höpken, one of Arvid Horn's most determined opponents and a founder of the Hat party.
Document 9: Ulf Holm: Ulf Holm, born June 4, 1969 in Lund, is a Swedish Green Party politician, member of the Riksdag since 2002. He was a member of the European Parliament during 1995-1999. He is openly gay.
Document 10: Same-sex marriage in Sweden: On 21 January 2009, a bill was introduced in the Swedish Parliament to make the legal concept of marriage gender-neutral. The bill was passed on 1 April and took effect on 1 May. The bill was supported by all parties except the Christian Democrats and one member of Centre Party. It passed with 261 votes in favour, 22 votes against and 16 abstentions.
Document 11: Fredrik Malm: Carl Fredrik Malm (born 2 May 1977 in Stockholm) is a Swedish politician and Member of Parliament for the Liberal People's Party. He was chairperson of the Liberal Youth of Sweden from 2002 to 2006.
Document 12: Same-sex marriage in the Netherlands: As early as the mid-1980s, a group of gay rights activists, headed by Henk Krol – then editor-in-chief of the Gay Krant – asked the Government to allow same-sex couples to marry. Parliament decided in 1995 to create a special commission, which was to investigate the possibility of same-sex marriages. At that moment, the Christian Democrats (Christian Democratic Appeal) were not part of the ruling coalition for the first time since the introduction of full democracy. The special commission finished its work in 1997 and concluded that civil marriage should be extended to include same-sex couples. After the election of 1998, the Government promised to tackle the issue. In September 2000, the final legislation draft was debated in the Dutch Parliament.
Document 13: Andreas Carlgren: Andreas Carlgren was born in Västra Ryd, Upplands-Bro Municipality, Stockholm County, Sweden. From 1981 and 1983 he studied at Stockholm University to become a teacher. He then worked as chairman of the Centre Party Youth from 1984 to 1987. From 1987 to 1990 he worked as a teacher, followed by employment at M-gruppen, a training company, to work on environmental development programmes for businesses, including environmental audits. From 1990 to 1994 he served as deputy mayor of Ekerö Municipality, with special responsibility for childcare and schools. From 1994 to 1998 he was elected as a member of the parliament of Sweden. In the parliament he was a member of the Committee on Education. In addition, Carlgren served as second deputy chairman of the Centre Party from 1992 to 1998 and as first deputy chairman from 1998 to 2000.
Document 14: Stockholm Arlanda Airport: Stockholm Arlanda Airport (IATA: ARN, ICAO: ESSA), is an international airport located in the Sigtuna Municipality of Sweden, near the town of Märsta, 37 kilometres (23 mi) north of Stockholm and nearly 40 kilometres (25 mi) south - east of Uppsala. The airport is located within Stockholm County and the province of Uppland. It is the largest airport in Sweden and the third - largest airport in the Nordic countries. The airport is the major gateway to international air travel for large parts of Sweden. Arlanda Airport was used by close to 27 million passengers in 2017, with 21.2 million international passengers and 5.5 million domestic.
Document 15: Arad International Airport: Arad International Airport is located west of Arad, in western Romania, in the historical region of Crișana. The airport is located only north of Timişoara Airport. Arad International Airport also has a cargo terminal, the largest and most modern in western Romania. It is located 250 km from Budapest and 300 km from Belgrad. It’s located near the border with Hungary, only 30 km from the closest point for crossing the border - Turnu and 20 km away from the closest railway point for crossing the border - Curtici. The airport also serves as the SMURD regional air ambulance base for the 5 western counties that form the region (Arad, Bihor, Timis, Hunedoara & Caras-Severin). SMURD Arad operates 1 Eurocopter EC135 converted for the air ambulance role. Arad Airport is directly connected to the A1 motorway (part of the Pan-European Corridor IV), one of the most important and heavily used motorways in Romania.
ground_truth: Stockholm Arlanda Airport
sub_queries: Ulf Holm >> member of political party Answer: Green Party
Green Party >> work location Answer: Stockholm
what is the main international airport in Stockholm Answer: Stockholm Arlanda Airport