DL 1247 then DL 9936 at Atlanta
Chicago O'Hare → Atlanta → Santa Clara
Timetable, Atlanta time
09:55DL 1247 from Chicago O'Hare at the gate
09:30DL 9936 to Santa Clara leaves the gate
23 h 35 apart on the timetable, overnight
DL 9936 leaves 23 h 35 after DL 1247 arrives on the timetable: more than half a day, so not a connection we count.