DL 1624 then DL 2235 at Atlanta
Memphis → Atlanta → Boston
Timetable, Atlanta time
09:25DL 1624 from Memphis at the gate
14:30DL 2235 to Boston leaves the gate
5 h 05 apart on the timetable
The last days
DL 1624 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.