DL 3110 then DL 2235 at Atlanta
Kansas City → Atlanta → Boston
Timetable, Atlanta time
11:03DL 3110 from Kansas City at the gate
14:30DL 2235 to Boston leaves the gate
3 h 27 apart on the timetable
The last days
DL 3110 and DL 2235 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.