My wife @
vbnet was messing around with business fares to South Africa and cam across this fare.
Sample dates July 17 out and July 31 back.
On GF it books to ET 505 to ADD and ET859 to JNB. Long layover and 737 to JNB.
I selected book on ET and was able to get ET505 and ET809 to JNB. 788 from LAX to ADD and A350 to JNB with a 4:20 layover in ADD. Same flights going back (ET808 and ET504).
Bookable on ET as a web special fare. Fare class P - No miles on UA.