DL 420 then AA 4498 at O'Hare
Savannah → Chicago → Harrisburg
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
11:45AA 4498 to Harrisburg leaves the gate
22 h 32 apart on the timetable, overnight
AA 4498 leaves 22 h 32 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.