Originally Posted by
christep
No - fails at the second sector: you can't travel via the point of origin. Otherwise fine as far as I can see.
Originally Posted by
747-444
So I would need to start outside of JNB?
Say PLZ-JNB-ETC?
Yes.
There's also a second problem, SEA-LAX is not on Oneworld metal (Alaska codeshare) thus not eligible for the Oneworld Explorer.
However your proposed route is less than 34,000 miles (around 31,500) so it would qualify for a Global Explorer 34,000 mile business class ticket (same price as a DONE4.) Alaska Airlines is now allowed for the GlobEx, so your route could fit within those product's rules. You might consult the Oneworld website about this.
Note too if you didn't want to transit LHR a second time AA flies nonstop BRU-JFK.