UA 3634 then DL 5799 at Charlotte
Washington → Charlotte → Boston
Timetable, Charlotte time
10:42UA 3634 from Washington at the gate
11:40DL 5799 to Boston leaves the gate
58 min apart on the timetable
The last days
UA 3634 and DL 5799 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.