FILE PHOTO: A South African Airways Airbus A320 aircraft arrives as a Kenya Airways Boeing 737 aircraft prepares to take off at the OR Tambo International Airport in Johannesburg

FILE PHOTO: A South African Airways Airbus A320-200 aircraft (bottom) arrives as a Kenya Airways Boeing 737-800 aircraft prepares to take off at the OR Tambo International Airport in Johannesburg, South Africa, March 8, 2017. REUTERS/Siphiwe Sibeko/File Photo