DL 2391 then DL 9963 at Atlanta
Boston → Atlanta → Queretaro
Timetable, Atlanta time
16:35DL 2391 from Boston at the gate
09:30DL 9963 to Queretaro leaves the gate
16 h 55 apart on the timetable, overnight
DL 9963 leaves 16 h 55 after DL 2391 arrives on the timetable: more than half a day, so not a connection we count.