DL 1668 then DL 2334 at Atlanta
Indianapolis → Atlanta → Buffalo
Timetable, Atlanta time
22:00DL 1668 from Indianapolis at the gate
21:59DL 2334 to Buffalo leaves the gate
23 h 59 apart on the timetable, overnight
DL 2334 leaves 23 h 59 after DL 1668 arrives on the timetable: more than half a day, so not a connection we count.