AA 4604 then AA 5191 at Philadelphia
St Louis → Philadelphia → Toronto
Timetable, Philadelphia time
09:20AA 4604 from St Louis at the gate
19:47AA 5191 to Toronto leaves the gate
10 h 27 apart on the timetable
The last days
AA 4604 and AA 5191 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.