DL 420 then ET 3511 at O'Hare
Savannah → Chicago → Muscat
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
09:05ET 3511 to Muscat leaves the gate
19 h 52 apart on the timetable, overnight
ET 3511 leaves 19 h 52 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.