UA 356 then AC 7305 at Atlanta
Chicago O'Hare → Atlanta → Toronto
Timetable, Atlanta time
17:38UA 356 from Chicago O'Hare at the gate
16:00AC 7305 to Toronto leaves the gate
22 h 22 apart on the timetable, overnight
AC 7305 leaves 22 h 22 after UA 356 arrives on the timetable: more than half a day, so not a connection we count.