UA 356 then DL 9963 at Atlanta
Chicago O'Hare → Atlanta → Queretaro
Timetable, Atlanta time
17:38UA 356 from Chicago O'Hare at the gate
09:30DL 9963 to Queretaro leaves the gate
15 h 52 apart on the timetable, overnight
DL 9963 leaves 15 h 52 after UA 356 arrives on the timetable: more than half a day, so not a connection we count.