DL 9951 then DL 8960 at Atlanta
Queretaro → Atlanta → San Francisco
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
17:51DL 8960 to San Francisco leaves the gate
21 h 13 apart on the timetable, overnight
DL 8960 leaves 21 h 13 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.