DL 420 then AA 3720 at O'Hare
Savannah → Chicago → Manchester
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
13:10AA 3720 to Manchester leaves the gate
23 h 57 apart on the timetable, overnight
AA 3720 leaves 23 h 57 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.