WN 239 then DL 9963 at Atlanta
St Louis → Atlanta → Queretaro
Timetable, Atlanta time
18:50WN 239 from St Louis at the gate
09:30DL 9963 to Queretaro leaves the gate
14 h 40 apart on the timetable, overnight
DL 9963 leaves 14 h 40 after WN 239 arrives on the timetable: more than half a day, so not a connection we count.