DL 9951 then DL 8964 at Atlanta
Queretaro → Atlanta → San Francisco
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
16:30DL 8964 to San Francisco leaves the gate
19 h 52 apart on the timetable, overnight
DL 8964 leaves 19 h 52 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.