AA 5904 then UA 3310 at Charlotte
Knoxville → Charlotte → Pittsburgh
Timetable, Charlotte time
13:40AA 5904 from Knoxville at the gate
18:15UA 3310 to Pittsburgh leaves the gate
4 h 35 apart on the timetable
The last days
AA 5904 and UA 3310 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.