DL 420 then AA 1366 at O'Hare
Savannah → Chicago → Denver
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
11:54AA 1366 to Denver leaves the gate
22 h 41 apart on the timetable, overnight
AA 1366 leaves 22 h 41 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.