DL 2579 then DL 2597 at Atlanta
Baltimore → Atlanta → Montréal
Timetable, Atlanta time
09:10DL 2579 from Baltimore at the gate
09:00DL 2597 to Montréal leaves the gate
23 h 50 apart on the timetable, overnight
DL 2597 leaves 23 h 50 after DL 2579 arrives on the timetable: more than half a day, so not a connection we count.