How is JNB as a mileage run airport?
By that, I mean arriving from a destination (likely either LHR or HKG) and transiting through JNB immediately back to the origin airport - so never exiting the airport.
This appears to be easy, especially if I already have a boarding pass in my hands as I arrive JNB - but it would be good to have some confirmation of that!
US traveler, so there don't appear to be any visa implications here.