AA 5348 then B6 8370 at Philadelphia
Knoxville → Philadelphia → Boston
Timetable, Philadelphia time
14:39AA 5348 from Knoxville at the gate
19:00B6 8370 to Boston leaves the gate
4 h 21 apart on the timetable
The last days
AA 5348 and B6 8370 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.