F9 1407 then DL 2862 at Atlanta
Buffalo → Atlanta → Oklahoma City
Timetable, Atlanta time
16:18F9 1407 from Buffalo at the gate
15:20DL 2862 to Oklahoma City leaves the gate
23 h 02 apart on the timetable, overnight
DL 2862 leaves 23 h 02 after F9 1407 arrives on the timetable: more than half a day, so not a connection we count.