AA 1571 then B6 833 at Boston
New York LaGuardia → Boston → San Francisco
Timetable, Boston time
12:44AA 1571 from New York LaGuardia at the gate
17:05B6 833 to San Francisco leaves the gate
4 h 21 apart on the timetable
The last days
AA 1571 and B6 833 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.