TravelOne,
You can find which OW carriers fly on a specific segment by using a freely downloadable program from Cathay Pacific's (CX) website.
http://www.cathaypacific.com/intl/pl...le/0,,,00.html
http://downloads.cathaypacific.com/9574_setup.exe
If the links do not work for you, navigate from the CX site under schedule and downloadable fares.
For HKG-DEL you will need to use CX. For DEL-JNB you can use BA. Many have codeshare numbers as well.
One of the challenges I see in drbala's itinerary is that JFK-HKG is only available on CX among OW carriers as a non-stop. Any problems there because of pilot problems at CX will involve rerouting. The problem is that because of pilot problems at CX, the only proposed nonstop flt is now unavailable. CX has a direct service (single flt number with intermediate stop) which will solve the problem as long as there are no strikes or cancellations at CX.