B6 837 then UA 4426 at Detroit
Boston → Detroit → Newark
Timetable, Detroit time
11:19B6 837 from Boston at the gate
16:10UA 4426 to Newark leaves the gate
4 h 51 apart on the timetable
The last days
B6 837 and UA 4426 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.