AA 9951 then AC 8517 at Philadelphia
Norfolk → Philadelphia → Toronto
Timetable, Philadelphia time
10:57AA 9951 from Norfolk at the gate
17:05AC 8517 to Toronto leaves the gate
6 h 08 apart on the timetable
The last days
AA 9951 and AC 8517 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.