Question: Which franchise carrier operates aircraft in full British Airways livery and has its main base at OR Tambo International Airport, Johannesburg?

Context paragraphs:
Interair South Africa: Inter Aviation Services (Pty) Ltd, which traded as Interair South Africa, is a formally privately owned airline based in Johannesburg, South Africa.  It operated scheduled passenger services from Johannesburg to regional destinations in Africa.  Its main base was O. R. Tambo International Airport, Johannesburg.

R24 road: The R24 is a major East-West provincial route in the Greater Johannesburg Metropolitan Area and North West province that links OR Tambo International Airport with Rustenburg via Johannesburg, Krugersdorp and Magaliesburg.  The process of renaming the streets and freeway that form the route from Krugersdorp eastward to OR Tambo International after Albertina Sisulu was completed in 2013.

African International Airways: African International Airways was an all-cargo airline based in Johannesburg, South Africa.  The airline operated international chartered cargo flights out of Kent International Airport, United Kingdom, OR Tambo International Airport, Johannesburg and Ostend-Bruges International Airport, Belgium, most of which were on behalf of Intavia Limited.

Egoli Air: Egoli Air is an airline based in Johannesburg, South Africa.  It operates charter flights both domestically and to destinations throughout Africa.  Its main base is OR Tambo International Airport, Johannesburg.

British Airways franchise destinations: British Airways flies to destinations on every inhabited continent.  In addition to the comprehensive list of destinations offered by British Airways itself, many more towns and cities can be reached through BA's franchise and subsidiary operations.  Together with wholly owned subsidiary BA CityFlyer, franchise carriers Sun Air and Comair operate aircraft in full British Airways livery, offer full BA service and staff wear BA uniform.  Bookings are made through British Airways and the carriers are affiliate members of the oneworld alliance.

O. R. Tambo International Airport: O. R. Tambo International Airport (IATA: JNB, ICAO: FAOR) (ORTIA) is a major international airport in Kempton Park, Ekurhuleni, Gauteng, South Africa, near the city of Johannesburg and, to a lesser extent, the executive capital Pretoria.  It serves as the primary airport for domestic and international travel to/from South Africa and is Africa's busiest airport with a capacity to handle up to 28 million passengers annually with non-stop flights to all continents except Antarctica.  The airport is the hub of South Africa's largest international and domestic carrier, South African Airways (SAA), and a number of smaller local airlines.  The airport handled a total of over 20 million passengers in 2016.

Nationwide Airlines (South Africa): Nationwide Airlines was an airline based in Lanseria, South Africa.  It operated scheduled domestic and international services.  Its main base was OR Tambo International Airport, Johannesburg.  On April 29, 2008 the Airline halted operations.

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.

Airlink Cargo: Airlink Cargo is a division of SA Airlink (Pty) Ltd and provides air freight transport services to over 35 destinations across Southern Africa from its base in Johannesburg.  The division was formed in 2011 after one British Aerospace Jetstream 41 passenger aircraft belonging to parent company Airlink was converted for freight operations, followed the next year by a second aircraft.  Freight is also carried on Airlink Cargo's behalf by Airlink and Swaziland Airlink across the region.  Airlink Cargo is headquartered on the grounds of their hub OR Tambo International Airport in Johannesburg, South Africa.

Comair (South Africa): Comair Limited is an airline based in South Africa that operates scheduled services on domestic routes as a British Airways franchisee (and an affiliate member of the Oneworld airline alliance).  It also operates as a low-cost carrier under its own kulula.com brand.  Its main base is OR Tambo International Airport, Johannesburg, and has focus cities at Cape Town International Airport and King Shaka International Airport.  Its headquarters are near OR Tambo in the Bonaero Park area of Kempton Park, Ekurhuleni, Gauteng.

Supporting paragraphs: British Airways franchise destinations Comair (South Africa)
Answer: Comair