DL 9941 then DL 1393 at Atlanta
Queretaro → Atlanta → St Louis
Timetable, Atlanta time
19:43DL 9941 from Queretaro at the gate
17:30DL 1393 to St Louis leaves the gate
21 h 47 apart on the timetable, overnight
DL 1393 leaves 21 h 47 after DL 9941 arrives on the timetable: more than half a day, so not a connection we count.