Question: Which low-cost airline is headquartered in Sydney?

full_context: Document 1: Coffs Harbour Airport: Coffs Harbour Airport: (IATA: CFS, ICAO: YCFS) (formerly ICAO code of YSCH until November 2007) is the only airport located in and serving the regional centre of Coffs Harbour, Australia. The airport is located near Boambee, south of Coffs Harbour. Coffs Harbour Regional Airport is one of the largest and busiest regional airports in New South Wales, handling numerous types of aircraft. The airport is currently serviced by four airlines QantasLink, Virgin Australia,
Document 2: RAAF Base Richmond: RAAF Base Richmond (IATA: XRH, ICAO: YSRI) is an Royal Australian Air Force (RAAF) military air base located within the City of Hawkesbury, approximately 50 km north-west of the Sydney central business district in New South Wales, Australia. Situated between the towns of Windsor and Richmond, the base is the oldest base in New South Wales and the second oldest in Australia. The base is home to the transport headquarters RAAF Air Lift Group, and its major operational formations, Nos. 84 and 86 Wings. The main aircraft type operated at the base is the Lockheed C-130 Hercules. Richmond is a regular venue for air shows, and has at times been mooted as a site for Sydney's proposed second international airport.
Document 3: Tigerair Australia: Tiger Airways Australia Pty Ltd, operating as Tigerair Australia, is an Australian low-cost airline. It commenced services in the Australian domestic airline market on 23 November 2007 as Tiger Airways Australia. It is a fully owned subsidiary of Virgin Australia Holdings. The airline is based in Melbourne, Victoria, with its main base at Melbourne Airport. The Civil Aviation Safety Authority of Australia (CASA) grounded the airline in 2011; as a result operating bases at Adelaide and Avalon were shut down and it initially only operated out of its Melbourne base after returning to the air. On 7 March 2012, Tigerair announced the reopening of a second base at Sydney Airport.
Document 4: Qantas: Qantas Airways ( ; ) is the flag carrier of Australia and its largest airline by fleet size, international flights and international destinations. It is the third oldest airline in the world, after KLM and Avianca having been founded in November 1920; it began international passenger flights in May 1935. The Qantas name comes from ""QANTAS"", an acronym for its original name, ""Queensland and Northern Territory Aerial Services"", and it is nicknamed "The Flying Kangaroo". Qantas is a founding member of the Oneworld airline alliance.
Document 5: Tigerair Australia destinations: Tigerair Australia (known as Tiger Airways Australia until July 2013) is a low-cost airline based in Melbourne, Australia. As of March 2014, it operates to 12 destinations in six states and territories across Australia, with 2 more destinations, Darwin and Whitsunday Coast, to be available from April, 2014. Tigerair Australia has operated flights to 17 destinations in Australia, but the majority of these destinations were discontinued after the grounding of the airline's entire fleet by the Civil Aviation Safety Authority in July 2011.
Document 6: Soekarno–Hatta International Airport: Soekarno–Hatta International Airport (Indonesian: "Bandar Udara Internasional Soekarno–Hatta" ) (IATA: CGK, ICAO: WIII) , abbreviated SHIA or Soetta, is the primary airport serving the Greater Jakarta area on the island of Java in Indonesia. Named after the first president and vice-president of Indonesia, Soekarno and Mohammad Hatta, the airport is located at Benda, Tangerang, approximately 20 km northwest of central Jakarta. Due to its proximity to the neighbourhood of Cengkareng in West Jakarta, the airport is also known as Cengkareng Airport, with the assigned three-letter IATA designator "CGK". The airport is the busiest and the largest airport in Indonesia, as well as being the busiest in the southern hemisphere. According to air travel intelligence company OAG, the airport ranked as the 7th most connected airport in the world & ranked 1st as 'megahub' airport in Asia-Pacific region as per connectivity index, ahead of Japan's Tokyo Haneda Airport and Australia's Sydney Airport .
Document 7: Jetstar Airways: Jetstar Airways Pty Ltd, trading as Jetstar, is an Australian low-cost airline (self-described as "value based") headquartered in Melbourne. It is a wholly owned subsidiary of Qantas, created in response to the threat posed by low-cost airline Virgin Blue. Jetstar is part of Qantas' two brand strategy of having Qantas Airways for the premium full-service market and Jetstar for the low-cost market. Jetstar carries 8.5% of all passengers travelling in and out of Australia.
Document 8: Jetstar Pacific destinations: Jetstar Pacific Airlines Joint Stock Aviation Company (operating as Jetstar Pacific) is a low-cost airline headquartered in Tan Binh District, Ho Chi Minh City, Vietnam. With its hub at Tan Son Nhat International Airport, Ho Chi Minh City, operates scheduled domestic and international services along with charter flights.
Document 9: Virgin Australia Regional Airlines: Virgin Australia Regional Airlines (formerly Skywest) is an Australian regional airline based in Perth; servicing key towns in the state of Western Australia as well as interstate destinations Darwin, Melbourne, Brisbane, Canberra and Sydney. It also serves regional destinations in New South Wales and Queensland and operates charter flights to Bali. In April 2013 Skywest was purchased by Virgin Australia Holdings as its new regional offshoot, and renamed Virgin Australia Regional Airlines.
Document 10: Sydney Airport: Sydney (Kingsford Smith) Airport (colloquially Mascot Airport, Kingsford Smith Airport, or Sydney Airport; IATA: SYD, ICAO: YSSY ; ) is an international airport in Sydney, Australia located 8 km (5 mi) south of Sydney city centre, in the suburb of Mascot. It is the primary airport serving Sydney, and is a primary hub for Qantas, as well as a secondary hub for Virgin Australia and Jetstar Airways. Situated next to Botany Bay, the airport has three runways, colloquially known as the east–west, north–south and third runways.
Document 11: Sydney Airport: Sydney (Kingsford Smith) Airport (colloquially Mascot Airport, Kingsford Smith Airport, or Sydney Airport; IATA: SYD, ICAO: YSSY ; ) is an international airport in Sydney, Australia located 8 km (5 mi) south of Sydney city centre, in the suburb of Mascot. It is the primary airport serving Sydney, and is a primary hub for Qantas, as well as a secondary hub for Virgin Australia and Jetstar Airways. Situated next to Botany Bay, the airport has three runways, colloquially known as the east–west, north–south and third runways.
Document 12: Guangzhou Baiyun International Airport: Guangzhou Baiyun International Airport (IATA: CAN, ICAO: ZGGG) is the major airport of Guangzhou, the capital of Guangdong province, China. Both airport codes were inherited from the former Baiyun Airport, and the IATA code is derived from Guangzhou's historical romanization "Canton". Baiyun Airport serves as a hub for China Southern Airlines, FedEx Express, 9 Air, Hainan Airlines and Shenzhen Airlines.
Document 13: Qantas Flights 7 and 8: Qantas Flight 7 (QF7/QFA7) and Qantas Flight 8 (QF8/QFA8) are flights operated by Australian airline Qantas between Sydney Airport and Dallas/Fort Worth International Airport, which from 2013-2016 were the longest regularly scheduled non-stop commercial flights in the world. They are currently the third longest regularly scheduled non-stop commercial flights in the world as measured by distance —13804 km , which is over one third of the distance around Earth. Both flights are operated with Airbus A380 aircraft.
Document 14: Jetstar Pacific: Jetstar Pacific Airlines Joint Stock Aviation Company (operating as Jetstar Pacific) is a low-cost airline headquartered in Tan Binh District, Ho Chi Minh City, Vietnam. With its hub at Tan Son Nhat International Airport, Ho Chi Minh City, operates scheduled domestic and international services along with charter flights.
Document 15: Virgin Australia: Virgin Australia Airlines Pty Ltd, formerly Virgin Blue Airlines, is Australia's second-largest airline after Qantas and it is the largest airline by fleet size to use the 'Virgin' brand. Now based in Bowen Hills, Brisbane, the airline was co-founded by British businessman Richard Branson, the founder of parent Virgin Group and former Virgin Blue CEO Brett Godfrey. It was established in November 1999 with two aircraft operating on a single route, and suddenly found itself catapulted to the position of Australia's second airline after the collapse of Ansett Australia in September 2001. The airline has grown to directly serve 29 cities in Australia from hubs in Brisbane, Melbourne and Sydney, using a fleet of narrow-body Boeing and Embraer jets; and Airbus and Boeing widebody jets.
ground_truth: Jetstar Airways