AA 1046 then DL 2250 at Atlanta
Miami → Atlanta → Boston
Timetable, Atlanta time
10:02AA 1046 from Miami at the gate
13:50DL 2250 to Boston leaves the gate
3 h 48 apart on the timetable
The last days
AA 1046 and DL 2250 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.