F9 702 then DL 821 at Atlanta
Austin → Atlanta → Boston
Timetable, Atlanta time
14:37F9 702 from Austin at the gate
18:30DL 821 to Boston leaves the gate
3 h 53 apart on the timetable
The last days
F9 702 and DL 821 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.