DL 9941 then DL 518 at Atlanta
Queretaro → Atlanta → Boston
Timetable, Atlanta time
19:43DL 9941 from Queretaro at the gate
16:25DL 518 to Boston leaves the gate
20 h 42 apart on the timetable, overnight
DL 518 leaves 20 h 42 after DL 9941 arrives on the timetable: more than half a day, so not a connection we count.