DL 420 then AA 2879 at O'Hare
Savannah → Chicago → Charlotte
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
11:47AA 2879 to Charlotte leaves the gate
22 h 34 apart on the timetable, overnight
AA 2879 leaves 22 h 34 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.