DL 2879 then ET 3511 at O'Hare
Atlanta → Chicago → Muscat
Timetable, Chicago time
19:05DL 2879 from Atlanta at the gate
09:05ET 3511 to Muscat leaves the gate
14 h apart on the timetable, overnight
ET 3511 leaves 14 h after DL 2879 arrives on the timetable: more than half a day, so not a connection we count.