F9 1407 then DL 9963 at Atlanta
Buffalo → Atlanta → Queretaro
Timetable, Atlanta time
16:26F9 1407 from Buffalo at the gate
09:30DL 9963 to Queretaro leaves the gate
17 h 04 apart on the timetable, overnight
DL 9963 leaves 17 h 04 after F9 1407 arrives on the timetable: more than half a day, so not a connection we count.