DL 420 then UA 762 at O'Hare
Savannah → Chicago → San Francisco
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
11:52UA 762 to San Francisco leaves the gate
22 h 39 apart on the timetable, overnight
UA 762 leaves 22 h 39 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.