Question: South African Airways has a low-cost partier that is based at which airport?

Context paragraphs:
Dudu Myeni: Duduzile Cynthia Myeni (born 29 October 1963), also known as "Dudu", is a South African businesswoman, the chairperson of South African Airways SOC Limited since January 2015, and the Executive Chairperson of the Jacob G Zuma Foundation since September 2008.  She is known for her controversial involvement with South African Airways and as a close friend of South African president Jacob Zuma.

Nigeria Airways: Nigeria Airways Ltd., more commonly known as "Nigeria Airways", was a Nigerian airline.  The company was founded in 1958 after the dissolution of West African Airways Corporation (WAAC).  It held the name "WAAC Nigeria" until 1971, when it was rebranded to the name it had until it ceased operations in 2003.  The government of Nigeria owned a majority of the airline (51%) until 1961, when it boosted its participation in the company to 100% and made it the country's flag carrier.  At the time of dissolution, the airline's headquarters were at Airways House in Abuja.  Operations were concentrated at Murtala Muhammed International Airport and served both domestic and international destinations mainly concentrated in West Africa; the network also had points in Europe, North America and Saudi Arabia.  The airline was managed by a number of foreign companies, including British Airways, the Dutch company KLM and South African Airways.

South African Airways Museum Society: The South African Airways Museum Society is an aviation museum based at Rand Airport in Germiston, Gauteng, South Africa.  The museum was founded in 1986 and houses a collection of South African Airways memorabilia such as photos and aircraft scale models.  The museum also has a collection of static display aircraft including two Boeing 747s donated to them in 2004 and 2006.  The museum is funded by entrance fees to the museum and by renting out the aircraft interiors for corporate functions.  The flying aircraft of the museum are known as the South African Historic Flight collection, the aircraft are owned by the South African Airways Museum Society and are leased to the company Skyclass Aviation, who operate them for charter usage.

South African Airways Flight 406: South African Airways Flight 406, also known as the Rietbok Crash, was a scheduled passenger flight on 13 March 1967 that crashed into the sea on approach to East London, South Africa.  All 25 passengers and crew on board were killed.  The air accident report speculated, without supporting evidence, that the pilot of the plane suffered a heart attack while on approach and the co-pilot was unable to regain control of the aircraft.  Like the crash of South African Airways Flight 295 two decades later, there was, and still is great contention about the ultimate cause of the aircraft accident.

South African Airways destinations: This is a list of South African Airways destinations, as of 2016 .  It does not include destinations served by South African Express.  s of 2016 , South African Airways served eight destinations outside Africa.  By that time, the top five international routes were Johannesburg–New York City–JFK, Johannesburg–London Heathrow, Johannesburg–Hong Kong, Johannesburg–Frankfurt and Johannesburg–Perth.

South African Airways: South African Airways (SAA) is the flag carrier of South Africa.  Its headquarters are in Airways Park on the grounds of OR Tambo International Airport in Kempton Park, Ekurhuleni, Gauteng.  The airline flies to 56 destinations worldwide, in partnership with SA Express, SA Airlink and its low-cost carrier, Mango, within South Africa and across the continent, and eight intercontinental routes from its Johannesburg hub at OR Tambo International Airport, using a fleet of 54 aircraft.  Musa Zwane has been acting CEO since November 2015.

Mango (airline): Mango Airlines SOC Ltd, trading as Mango, is a state-owned South African low-cost airline based at OR Tambo International Airport near Johannesburg and a subsidiary of South African Airways.

Air Tanzania: Air Tanzania Company Limited (ATCL) (Swahili: "Kampuni ya Ndege Tanzania" ) is the flag carrier airline of Tanzania based in Dar es Salaam with its hub at Julius Nyerere International Airport.  It was established as Air Tanzania Corporation (ATC) in 1977 after the dissolution of East African Airways and has been a member of the African Airlines Association since its inception.  The airline was wholly owned by the Tanzanian Government until 2002 when it was partially privatised as per the directive of the Bretton Woods Institutions to implement the country's Structural Adjustment Program.  The government therefore reduced its shareholding to 51 percent and entered into a partnership with South African Airways.

South African Express: South African Express Airways SOC Ltd, known as South African Express or simply SA Express, is a state-owned airline based in South Africa that started operations on 24 April 1994.  Although the airline is operationally independent of South African Airways, its flights are incorporated within the strategic alliance with South African Airways.  The airline has its head office at Airways Park, Jones Road, next to O.R. Tambo International Airport in Kempton Park, Ekurhuleni, Gauteng.

South West African Airways: South West African Airways was the first commercial air service in South West Africa (now Namibia).  It operated from 1930 until 1935, when it was taken over by South African Airways.

Supporting paragraphs: South African Airways Mango (airline)
Answer: OR Tambo International Airport