DL 1072 then DL 2597 at Atlanta
Key West → Atlanta → Montréal
Timetable, Atlanta time
09:35DL 1072 from Key West at the gate
09:00DL 2597 to Montréal leaves the gate
23 h 25 apart on the timetable, overnight
DL 2597 leaves 23 h 25 after DL 1072 arrives on the timetable: more than half a day, so not a connection we count.