DL 9941 then DL 726 at Atlanta
Queretaro → Atlanta → Boston
Timetable, Atlanta time
19:43DL 9941 from Queretaro at the gate
13:50DL 726 to Boston leaves the gate
18 h 07 apart on the timetable, overnight
DL 726 leaves 18 h 07 after DL 9941 arrives on the timetable: more than half a day, so not a connection we count.