DL 9941 then DL 543 at Atlanta
Queretaro → Atlanta → St Louis
Timetable, Atlanta time
19:43DL 9941 from Queretaro at the gate
15:45DL 543 to St Louis leaves the gate
20 h 02 apart on the timetable, overnight
DL 543 leaves 20 h 02 after DL 9941 arrives on the timetable: more than half a day, so not a connection we count.