AA 1809 then DL 9969 at Boston
Charlotte → Boston → Atlanta
Timetable, Boston time
12:35AA 1809 from Charlotte at the gate
16:15DL 9969 to Atlanta leaves the gate
3 h 40 apart on the timetable
The last days
AA 1809 and DL 9969 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.