AA 5380 then AA 3186 at Philadelphia
Milwaukee → Philadelphia → Boston
Timetable, Philadelphia time
09:13AA 5380 from Milwaukee at the gate
13:01AA 3186 to Boston leaves the gate
3 h 48 apart on the timetable
The last days
AA 5380 and AA 3186 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.