Originally Posted by
angetenar
CPT and JNB are both level 3 airports. However, I am not sure if the slot limit is at CPT or if they are running up against the limit on weekly US-ZA flights; I don't think the US and ZA have an open skies agreement, but I also can't find a current air transport agreement; all that I've found is one from 1996, which has weekly frequency limits but only until 2001.
The limit is on total weekly US-ZA flights by US carriers, which is at 21. We currently have 7x weekly EWR-JNB on UA, 7x weekly ATL-JNB on DL, and 3x weekly EWR-CPT on UA, leaving 4x weekly slots unused.