B6 8662 then DL 8849 at Boston
Kansas City → Boston → Newark
Timetable, Boston time
14:52B6 8662 from Kansas City at the gate
18:15DL 8849 to Newark leaves the gate
3 h 23 apart on the timetable
The last days
B6 8662 and DL 8849 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.