DL 9951 then DL 2939 at Atlanta
Queretaro → Atlanta → Memphis
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
18:29DL 2939 to Memphis leaves the gate
21 h 51 apart on the timetable, overnight
DL 2939 leaves 21 h 51 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.