DL 211 then UA 324 at Atlanta
Cape Town → Atlanta → Chicago O'Hare
Timetable, Atlanta time
06:00DL 211 from Cape Town at the gate
22:00UA 324 to Chicago O'Hare leaves the gate
16 h apart on the timetable
UA 324 leaves 16 h after DL 211 arrives on the timetable: more than half a day, so not a connection we count.