DL 923 then DL 9936 at Atlanta
Boston → Atlanta → Queretaro
Timetable, Atlanta time
10:57DL 923 from Boston at the gate
08:00DL 9936 to Queretaro leaves the gate
21 h 03 apart on the timetable, overnight
DL 9936 leaves 21 h 03 after DL 923 arrives on the timetable: more than half a day, so not a connection we count.