Question: how far away is the headquarters of PrivatAir from the city center?

full_context: Document 1: City Airline: City Airline AB was a regional airline based in the Air Cargo Building on the grounds of Göteborg Landvetter Airport in Landvetter, Härryda Municipality, Sweden. It was privately owned and operated a medium-sized European network from its main base at Landvetter. The airline was wholly owned by Investment AB Janus of Gothenburg and employed 110 staff (as of July 2007). On 29 November 2011 the City Airline name was dropped after being acquired by Skyways, and all flights were then operated under the Skyways brand. In May 2012 Skyways and City Airline filed for bankruptcy.
Document 2: EasyJet Switzerland: EasyJet Switzerland SA, styled as easyJet, is a Swiss low-cost airline based in Meyrin, Geneva. It operates scheduled flights as an EasyJet franchisee from Geneva Airport and EuroAirport Basel–Mulhouse–Freiburg.
Document 3: AirClub: The AirClub is a 2012 founded airline alliance of seven airlines. It is considered to be the first and only airline alliance of business airlines, in the world. The alliance has a fleet of over 100 aircraft and is headquartered in Geneva, Switzerland.
Document 4: 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 5: PrivatAir: PrivatAir is a Swiss airline operating business jets, headquartered at Geneva Airport in Meyrin. It operates scheduled services for other airlines as well as charter flights for corporations and VIPs.
Document 6: Heathrow Airport: Heathrow Airport (also known as London Heathrow) (IATA: LHR, ICAO: EGLL) is a major international airport in London, United Kingdom. Heathrow is the second busiest airport in the world by international passenger traffic (surpassed by Dubai International in 2014), as well as the busiest airport in Europe by passenger traffic, and the seventh busiest airport in the world by total passenger traffic. In 2016, it handled a record 75.7 million passengers, a 1.0% increase from 2015.
Document 7: Gatwick Airport: Gatwick Airport (also known as London Gatwick) (IATA: LGW, ICAO: EGKK) is a major international airport in south-east England, 29.5 mi south of Central London and 2.7 NM north of Crawley. It is the second-busiest airport by total passenger traffic in the United Kingdom, after London Heathrow. Gatwick is the eighth-busiest airport in Europe. Until 2016, it was the busiest single-use runway airport in the world before being overtaken by Mumbai's Chhatrapati Shivaji International Airport.
Document 8: Air charter: Air charter is the business of renting an entire aircraft (i.e., chartering) as opposed to individual aircraft seats (i.e., purchasing a ticket through a traditional airline). While the airlines specialize in selling transportation by the seat, air charter companies focus on individual private aircraft and itineraries, urgent or time-sensitive cargo, air ambulance service, and other forms of "ad hoc" air transportation. Some air charters brokers have been given economic authority to sell seats on private jets with mixed success. Some air charter companies offer a large variety of aircraft, such as helicopters and business jets. Charter jet categories include turbo props, light jets, mid-size jets, super mid-size jets, heavy jets, long-range jets and VIP airliners.
Document 9: Swiss International Air Lines: Swiss International Air Lines AG (short Swiss, stylized as SWISS) is the national airline of Switzerland operating scheduled services in Europe and to North America, South America, Africa and Asia. Its main hub is Zurich Airport, with a focus city operation at Geneva Airport. The airline was formed after the 2001 bankruptcy of Swissair, Switzerland's former flag carrier.
Document 10: Geneva Airport: Geneva Airport (IATA: GVA, ICAO: LSGG) , formerly and still unofficially known as "Cointrin Airport", is the international airport of Geneva, the second most populous city in Switzerland. It is located 4 km northwest of the city centre. It reached 15 million passengers for the first time in December 2014 and serves as a hub for Swiss International Air Lines, easyJet Switzerland and Etihad Regional. Geneva features a route network of flights mainly to European metropolitan and leisure destinations as well as some long-haul routes to North America, China and the Middle East, amongst them Swiss International Air Lines' only long-haul service (to New York City) outside of Zürich.
Document 11: Comlux: Comlux - The Aviation Group is a corporate charter airline based in Switzerland, with subsidiaries under a separate AOC in Malta, Aruba and Kazakhstan, and regional branches in Russia, the United States, Bahrain and Hong Kong. Comlux holds three AOCs: one in Malta, one in Aruba and one in Kazakhstan. They also used to hold one in Switzerland.
Document 12: 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 13: Skymetro: The Zurich Airport Skymetro is an underground airport people mover at Zurich Airport in Switzerland. The 1.1 km long system connects the airport's main "Airside Center" with its mid-field "Terminal E", passing underneath Runway 10/28. The line opened in September 2003, and was constructed by the Otis Elevator Company.
Document 14: Crossair: Crossair Ltd. Co. for Regional European Air Transport (German: Crossair AG für europäischen Regionalluftverkehr ) was a regional airline headquartered on the grounds of EuroAirport Basel-Mulhouse-Freiburg in Saint-Louis, Haut-Rhin, France, near Basel, Switzerland. It became Swiss International Air Lines after taking over most of the assets of Swissair following that airline's bankruptcy in 2002.
Document 15: 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.
ground_truth: 4 km