DL 560 then AC 8504 at Atlanta
Seattle → Atlanta → Toronto
Timetable, Atlanta time
07:13DL 560 from Seattle at the gate
10:45AC 8504 to Toronto leaves the gate
3 h 32 apart on the timetable
The last days
DL 560 and AC 8504 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.