DL 1007 then DL 2266 at Atlanta
Washington National → Atlanta → Buffalo
Timetable, Atlanta time
21:41DL 1007 from Washington National at the gate
12:52DL 2266 to Buffalo leaves the gate
15 h 11 apart on the timetable, overnight
DL 2266 leaves 15 h 11 after DL 1007 arrives on the timetable: more than half a day, so not a connection we count.