AA 820 then DL 2597 at Atlanta
Dallas-Fort Worth → Atlanta → Montréal
Timetable, Atlanta time
10:22AA 820 from Dallas-Fort Worth at the gate
09:00DL 2597 to Montréal leaves the gate
22 h 38 apart on the timetable, overnight
DL 2597 leaves 22 h 38 after AA 820 arrives on the timetable: more than half a day, so not a connection we count.