DL 789 then DL 2597 at Atlanta
Charleston (South Carolina) → Atlanta → Montréal
Timetable, Atlanta time
09:20DL 789 from Charleston (South Carolina) at the gate
09:00DL 2597 to Montréal leaves the gate
23 h 40 apart on the timetable, overnight
DL 2597 leaves 23 h 40 after DL 789 arrives on the timetable: more than half a day, so not a connection we count.