And don't forget the right Vaccinations...I flew (deadheaded) on SAA from NBO to JNB a few months ago and one member of our crew did not have his "shot record" with him...the airline refused boarding and he had to get a new Yellow Fever shot and therefore new shot record before he could board...
He barely made the flight...sorta like OJ Simpson running through the airport.
Later found out that South Africa requires a current Yellow Fever vaccine if you are traveling from within Africa into South Africa...
Lots of issues to consider...jumpseating is likely NOT a good idea in this case. But, good luck anyway.