UA 3575 then DL 2629 at Montréal
Chicago → Montréal → Atlanta (ATL)
Timetable, Montréal time
14:00UA 3575 from Chicago at the gate
12:44DL 2629 to Atlanta (ATL) leaves the gate
22 h 44 apart on the timetable, overnight
DL 2629 leaves 22 h 44 after UA 3575 arrives on the timetable: more than half a day, so not a connection we count.