Question: Hi Fly Malta is a subsidiary of a charter airline located in what city?

full_context: Document 1: 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 2: Hi Fly Malta: Hi Fly Malta is a Maltese charter airline based at Malta International Airport and a subsidiary of the Portuguese Hi Fly.
Document 3: Líder Aviação: Líder Aviação (Líder Aviation) is a Brazilian airline specialising in air charter, aircraft sales and aircraft maintenance. Its main base is in Belo Horizonte, Minas Gerais, where it has a presence at both airports. It has other bases throughout Brazil; at Congonhas Airport and Guarulhos International Airport in São Paulo, Santos Dumont Airport, Jacarepaguá Airport and Galeão International Airport in Rio de Janeiro, Brasília International Airport, Recife's Guararapes International Airport, Macaé Airport, Val de Cães International Airport in Belém, Vitória Airport, Salvador International Airport, Porto Alegre's Salgado Filho International Airport, and Eduardo Gomes International Airport in Manaus. Bristow Group, a large U.S. based helicopter operator with worldwide operations supporting the offshore oil and gas industry, has a financial stake in Lider.
Document 4: Hi Fly (airline): Hi Fly is a Portuguese charter airline headquartered in Lisbon.
Document 5: Malta International Airport: Malta International Airport (Maltese: "Ajruport Internazzjonali ta' Malta" , IATA: MLA, ICAO: LMML ) is the only airport in Malta and it serves the whole of the Maltese Islands. It is located on island of Malta, between Luqa and Gudja, and occupies the location of the former RAF Luqa. It was completely refurbished, becoming fully operational on 25 March 1992. It is still referred to by locals as Luqa Airport, and sometimes as Valletta Airport internationally, as it is located 5 km southwest of the Maltese capital Valletta. The airport serves as the main hub for Air Malta and a base for Ryanair. It is also home to the Area Control Center and hosts the annual Malta Airshow, visited by military and civil aircraft from various European and other countries. The airport is operated by Malta International Airport plc.
Document 6: FlyOne: FlyOne (stylized as FLYONE) is a privately owned low-cost airline headquartered in Chișinău, Moldova. FlyOne operates scheduled and charter flights from its base at Chișinău International Airport.
Document 7: Air X Charter: Air X Charter is an airline based in Malta, offering airline charter services to destinations on-demand. The company is headquartered in Malta, and has its base of operations located at Malta International Airport.
Document 8: Filair: Filair is an airline based in the Democratic Republic of the Congo. Its operates from N'Dolo Airport, in Kinshasa. The airline is on the list of air carriers banned in the European Union, as are all airlines regulated by the authorities in the DRC.
Document 9: TAP Express: TAP Express (Transportes Aéreos Portugueses or TAP for short) is a Portuguese regional airline brand name for TAP Portugal which operate short- and medium-haul routes. TAP Portugal's lone wholly owned regional airline, Portugália Airlines, operates under the TAP Express banner. White Airways, an airline owned by Omni Aviation, also operates regular flights for TAP Express using 9 ATR 72 turboprops. Its head office is on the grounds of Lisbon Portela Airport in Lisbon.
Document 10: FlyMe: Fly Me Europe AB, operating as FlyMe, was a low-cost airline based in Gothenburg, Sweden. It operated flights from Gothenburg, Stockholm and Malmö to destinations within Europe. Its main hub was Göteborg Landvetter Airport, with hubs at Malmö Airport and Stockholm-Arlanda Airport. Beginning in April 2006, it widened its destination network and started daily services to European destinations. Majority owner of the business was English Billionaire John Robert Porter and his Norwegian business partner Christen Ager-Hanssen. They also had a majority interest in another airline Global Supply Systems a British all cargo carrier. FlyMe acquired in late 2006 a 25% stake in Global Supply Systems holding company Riverdon ltd with the aim to create a low cost long haul product.
Document 11: Malaysia Airlines: Malaysia Airlines Berhad (MAB) (Malay: "Penerbangan Malaysia Berhad" ), formerly known as Malaysian Airline System Berhad (MAS) (Malay: "Sistem Penerbangan Malaysia" ), branded as Malaysia Airlines, is a major airline operating flights from Kuala Lumpur International Airport and from secondary hubs in Kota Kinabalu and Kuching to destinations throughout Asia, Oceania and Europe. Malaysia Airlines is the flag carrier of Malaysia and a member of the oneworld airline alliance. The company's headquarters are located at Kuala Lumpur International Airport. In August 2014, the Malaysian government's sovereign wealth fund Khazanah Nasional—which then owned 69.37% of the airline—announced its intention to purchase remaining ownership from minority shareholders and de-list the airline from Malaysia's stock exchange, thereby renationalising the airline.
Document 12: Air 26: Air26 - Linhas Aéreas, S.A. is an airline based in Luanda, Angola. Founded in 2006, it operates domestic passenger and cargo flights out of the city's Quatro de Fevereiro Airport. Along with all other Angolan airlines except for TAAG, Air 26 is banned from operating within the European Union. In 2010, the company had its licence revoked, but it was re-issued on 31 January 2011.
Document 13: 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 14: 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 15: 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.
ground_truth: Lisbon