AA 1047 then B6 8412 at O'Hare
Philadelphia → Chicago → Boston
Timetable, Chicago time
11:05AA 1047 from Philadelphia at the gate
16:00B6 8412 to Boston leaves the gate
4 h 55 apart on the timetable
The last days
AA 1047 and B6 8412 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.