Originally Posted by
guv1976
Are all flights on a single ticket? If so, the UA agent at SMF should be able to through-check your bags all the way to JNB. You should not see them again until you get to baggage claim at JNB.
Just inspect your baggage claim checks at SMF to make sure that JNB appears as the final destination on the checks.
Yes, it is a single ticket. Thanks for the information