DL 420 then AA 4156 at O'Hare
Savannah → Chicago → Green Bay
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
13:00AA 4156 to Green Bay leaves the gate
23 h 47 apart on the timetable, overnight
AA 4156 leaves 23 h 47 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.