DL 9951 then AA 4800 at Atlanta
Queretaro → Atlanta → Washington National
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
17:01AA 4800 to Washington National leaves the gate
20 h 23 apart on the timetable, overnight
AA 4800 leaves 20 h 23 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.