DL 420 then AA 1968 at O'Hare
Savannah → Chicago → Tucson
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
11:40AA 1968 to Tucson leaves the gate
22 h 27 apart on the timetable, overnight
AA 1968 leaves 22 h 27 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.