AA 1960 then AA 1828 at Charlotte
San Francisco → Charlotte → Boston
Timetable, Charlotte time
16:58AA 1960 from San Francisco at the gate
17:40AA 1828 to Boston leaves the gate
42 min apart on the timetable
The last days
AA 1960 and AA 1828 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.