The raw fare for an AONE4 ex-CAI today is US$4,775. You will spend US$1-3,000 more to buy the same ticket elsewhere in Africa and Asia and US$4,400 more to buy it in the US. It is unlikely we will see any deals this good for a long time -- at least not until the US$ strengthens considerably against most other world currencies.
Edited to add -
If you book a second trip, you do not have to spell it out in detail. Just keep it simple like CAI-LHR-LAX-SYD-HKG-LHR-CAI. You can change it later to what you really want for a measly US$75.
[This message has been edited by ExMo (edited Dec 21, 2003).]