One last question.

We've got our itinerary sorted and ready to pay for the flight, but my travel partner might have to go to Jakarta & Singapore (business related) around the time the trip ends. So we were thinking of just extending the trip and in stead of HKN-JHB we go to those destinations before flying home.

The only problem is that we won't know until a few weeks before we leave in Sept. Would Oneworld allow you to ad flights at a later stage after payment?

We were thinking of booking it anyway (just in case), but the problem is that if we don't go we'll have to change those flights back and might not get the good seats (or any seats) on the HKN - JHB flight.