AA 3657 then AA 9785 at O'Hare
Key West → Chicago → Philadelphia
Timetable, Chicago time
16:00AA 3657 from Key West at the gate
21:00AA 9785 to Philadelphia leaves the gate
5 h apart on the timetable
Today
From the airport’s board at 06:07 Chicago time
16:00AA 3657 due at the gate, no estimate yet
21:00AA 9785 is cancelled
The last days
AA 3657 and AA 9785 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.