DL 8851 then DL 821 at Atlanta
Ottawa → Atlanta → Boston
Timetable, Atlanta time
19:05DL 8851 from Ottawa at the gate
17:50DL 821 to Boston leaves the gate
22 h 45 apart on the timetable, overnight
DL 821 leaves 22 h 45 after DL 8851 arrives on the timetable: more than half a day, so not a connection we count.