Thanks mrs767er and R.M.Anderson for replying so promptly.
"We" are 2, and his DOH is Apr/2012. .
Still trying to decide what to do, we do have some wiggle room on the way in; as the only thing schedule so far is KrugerPark 7 days after arrival (if we get on the 14/15th Aug flight).
On the way back we are flying back to Joburg from Maputo, Moz on Sunday and we may have 1 or 2 extra days to spare if we can get the Sunday flight back to ATL.
But again, looking the current load (Delta.com) for today and the next few days is not inspiring at all.