Looking to purchase a DONE4 ex-JFK ("Ticket 1") to get to JNB, and an AONE4 ex-JNB ("Ticket 2") to get out. Am I thinking about this correctly?

1. Fly JFK-JNB on Ticket 1.

Is JFK-LHR-JNB the only option?

If I book LHR-JNB as an AA flight (obviously on BA metal), instead of booking as a BA flight, do I save on the surcharges, or will it price out the same?

I assume if I only transit and do not have a stopover in LHR on my way to JNB, I can then use my Europe segments at a later date when I resume Ticket 1, correct?


2. Pause Ticket 1 in JNB.

3. Fly JNB-LHR on Ticket 2.

Is there any other option to use segments within Africa?

I will then use Ticket 2 to travel around Europe, and to return to the U.S. (probably via LHR; there are no ex-Europe OneWorld flights with F other than via LHR, are there?)

At a later date, I will use Ticket 2 to travel Transpacific to Asia and then onto JNB (via LHR), where I will resume Ticket 1 to return to Europe and travel around Europe and Asia before returning to the US Transpacific.

Am I missing anything? Any way to minimize the taxes and surcharges?