DL 1258 then DL 2597 at Atlanta
Austin → Atlanta → Montréal
Timetable, Atlanta time
09:40DL 1258 from Austin at the gate
09:00DL 2597 to Montréal leaves the gate
23 h 20 apart on the timetable, overnight
DL 2597 leaves 23 h 20 after DL 1258 arrives on the timetable: more than half a day, so not a connection we count.