Question: What city is the head office of József Váradi's airline located in?

full_context: Document 1: Wizz Air: Wizz Air, legally incorporated as "Wizz Air Hungary Ltd." (Hungarian: "Wizz Air Hungary Légiközlekedési Kft." ), is a Hungarian low-cost airline with its head office in Budapest. The airline serves many cities across Europe, Israel and the United Arab Emirates. It has the largest fleet of any Hungarian airline, although it is not a flag carrier, and currently serves 42 countries. Its Jersey based parent company, Wizz Air Holdings Plc, is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.
Document 2: Turkish Airlines: Turkish Airlines (Turkish: "Türk Hava Yolları") () is the national flag carrier airline of Turkey, headquartered at the Turkish Airlines General Management Building on the grounds of Atatürk Airport in Yeşilköy, Bakırköy, Istanbul. s of 2017 , it operates scheduled services to 302 destinations in Europe, Asia, Africa, and the Americas, making it the fourth-largest carrier in the world by number of destinations. It serves more destinations non-stop from a single airport than any other airline in Europe. Turkish Airlines flies to 120 countries, more than any other airline. With an operational fleet of fourteen cargo aircraft, the airline's cargo division serves 64 destinations. Istanbul Atatürk Airport is its main base, and there are secondary hubs at Esenboğa International Airport, Sabiha Gökçen International Airport, and Adnan Menderes Airport. Turkish Airlines has been a member of the Star Alliance network since 1 April 2008.
Document 3: ABC Air Hungary: ABC Air Hungary Ltd. (Hungarian: ABC Air Hungary Kft. ) is a cargo airline based at Budapest, Hungary. Its head office is located in Terminal 1 of Budapest Ferenc Liszt International Airport. Founded in 1998, the company operated daily cargo flights with LET-410-UVP-E, SAAB 340A, ATR-42, Airbus 300 and Boeing 737-300. The aircraft fleet consisted of three Let L-410 Turbolet in May 2010. It had also two SAAB 340A cargo variants. 2001 – the first long term contract with DHL. 2003 – extension of the business with operation for TNT and UPS. Cargo charter flights for the biggest courier companies – DHL, UPS, FEDEX and TNT, based on direct contracts, or in co-operation with Bridges Worldwide.ABC operated also ad-hock charter flights.
Document 4: Jezdimir Vasiljević: Jezdimir Vasiljević (born in Topolovnik, Socialist Republic of Serbia, Yugoslavia on November 1948), nicknamed Gazda Jezda ("Jezda the Boss"), is a controversial Serbian businessman. According to some sources, his initial investment capital was made through a marriage with a Swedish woman from a wealthy family. In 1992, he established the Jugoskandik Savings Bank, the first private-owned bank in Serbia (which was, at the time, still a republic within Yugoslavia). Although Jugoskandik operated in Serbia, the banking license was provided by "Banka Privatne Privrede" (BPP), bank owned by the local government of Montenegro (another republic within Yugoslavia). He unsuccessfully ran for President of Serbia on the 1992 elections.
Document 5: Budapest Ferenc Liszt International Airport: Budapest Ferenc Liszt International Airport (Hungarian: "Budapest Liszt Ferenc Nemzetközi Repülőtér" ) (IATA: BUD, ICAO: LHBP) , formerly known as "Budapest Ferihegy International Airport" and still commonly called just Ferihegy, is the international airport serving the Hungarian capital city of Budapest, and by far the largest of the country's four commercial airports. The airport is located 16 km southeast of the center of Budapest (bordering Pest county) and was renamed in 2011 in honor of the most famous Hungarian composer Franz Liszt (Hungarian Liszt Ferenc) on the occasion of the 200th anniversary of his birth. The airport won the Skytrax Best Eastern European airport prize three times in a row (2014-2016).
Document 6: CityJet: CityJet is an Irish regional airline with headquarters in Swords, County Dublin. It operates its own scheduled services out of London City Airport and to a lesser extent Dublin Airport, where it has maintenance facilities. The airline also operates wet-lease services on behalf of Air France (until October 2017), Scandinavian Airlines and Brussels Airlines. Air France sold CityJet to "Intro Aviation" in May 2014. In March 2016 the airline was bought by founder Pat Byrne and other investors.
Document 7: VistaJet: VistaJet is a global business aviation company founded in 2004 by Thomas Flohr. The firm flies government, corporate and private clients between any two points, under a "pay for hours flown" fare structure.
Document 8: Blue Air: Blue Air is an airline headquartered in Bucharest, with its main hubs at Henri Coandă International Airport and Turin Airport. Since 2016, it has become the largest Romanian airline by scheduled passengers flown. In 2016, Blue Air carried 3.6 million passengers, a significant increase over the 2 million passengers flown the previous year. As of May 2017, Blue Air flies to 70 destinations. Despite operating as a low-cost airline, Blue Air started introducing free sandwiches and drinks on-board shorter flights, and a full hot meal, snacks, hot/cold and alcoholic beverages on longer flights. This is considered unheard of in the low-cost sector, particularly as traditionally 'full service' carriers such as British Airways controversially removed free meals, snacks and drinks in 2017, and is considered key to Blue Air's continued success.
Document 9: Walter Varney: Walter Thomas Varney (December 26, 1888 in San Francisco, California – January 25, 1967 in Santa Barbara, California) was an American aviation pioneer who founded forerunners of two major U.S. airlines, United Airlines and Continental Airlines. Varney was also one of the most prominent airmail contractors of the early 20th century.
Document 10: Air Partner: Air Partner Plc is a global aviation services group. The Group is structured into four reporting divisions: Commercial Jet air charter, Private Jet Charter, air freight and Baines Simmons. The Commercial Jet division charters large airliners to move groups of any size. They also provide remarketing programmes for all types of commercial and corporate aircraft. Air Partner is headquartered alongside Gatwick airport in the United Kingdom. Air Partner operates 24/7 year-round and has 20 offices across Europe, North America, the Middle East and Asia. The company is publicly listed on the London Stock Exchange as LSE: [ AIR] , and is also ISO 9001:2008 compliant for commercial airline and private jet solutions worldwide.
Document 11: Vodafone Czech Republic: Vodafone Czech Republic a.s. is a Czech telecommunications company. It is among the largest Czech companies by revenue. It was established as Český Mobil (Czech Mobile) in 1999, when the government of Miloš Zeman granted it a free license to operate the third mobile GSM network. Its mobile network was called Oskar; the company itself was renamed in September 2004 to Oskar Mobil. In 2005 the international company Vodafone became the sole shareholder, which in November 2005, approved the most recent change in the company name. Czech Vodafone currently has over 3 million customers. The director is Balesh Sharma since the end of 2013.
Document 12: Flybe: Flybe (pronounced ) is the largest independent regional airline in Europe, based in Exeter, operating more UK domestic flights than any other airline. It flies 7 million passengers a year on 149 routes, from 62 destinations in 9 countries, connecting to long-haul hubs in Manchester, Birmingham, Paris, Dublin and Amsterdam. It is a member of the European Regions Airline Association. Flybe's parent company Flybe Group PLC (formerly known as Walker Aviation Limited) is listed on the London Stock Exchange.
Document 13: Jonathan G. Ornstein: Jonathan Ornstein is Chairman and Chief Executive Officer of Mesa Air Group, Inc., and was appointed effective May 1, 1998. From April 1996 to his joining the company as Chief Executive Officer, Ornstein served as President and Chief Executive Officer and Chairman of Virgin Express, a European airline. From 1995 to April 1996, Ornstein served as Chief Executive Officer of Virgin Express Holdings, Inc. Ornstein joined Continental Express as President and Chief Executive Officer in July 1994 and, in November 1994, was named Senior Vice President, Airport Services at Continental Airlines. Ornstein was previously employed by the company from 1988 to 1994, as Executive Vice President and as President of the company’s WestAir Holding, Inc., subsidiary.
Document 14: József Váradi: József Janos Váradi (born 21 September 1965) is a Hungarian businessman who co-founded Wizz Air and has been its CEO since 2003.
Document 15: Bertalan Farkas: Bertalan Farkas (born August 2, 1949) is the first Hungarian cosmonaut and the first Esperantist in space. He is currently the president of Airlines Service and Trade. With Charles Simonyi's travel, Farkas is no longer the only Hungarian who has been to space (he is still the only astronaut, as Simonyi flew as a space tourist).
ground_truth: Budapest