DL 420 then AA 1479 at O'Hare
Savannah → Chicago → Boston
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
12:06AA 1479 to Boston leaves the gate
22 h 53 apart on the timetable, overnight
AA 1479 leaves 22 h 53 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.