DL 9951 then DL 950 at Atlanta
Queretaro → Atlanta → Washington National
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
16:40DL 950 to Washington National leaves the gate
20 h 02 apart on the timetable, overnight
DL 950 leaves 20 h 02 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.