DL 9951 then DL 1189 at Atlanta
Queretaro → Atlanta → Allentown
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
15:16DL 1189 to Allentown leaves the gate
18 h 38 apart on the timetable, overnight
DL 1189 leaves 18 h 38 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.