DL 571 then AA 4801 at Boston
San Diego → Boston → St Louis
Timetable, Boston time
06:35DL 571 from San Diego at the gate
10:15AA 4801 to St Louis leaves the gate
3 h 40 apart on the timetable
Today
From the airport’s board at 04:47 Boston time
06:15DL 571 expected at the gate20 min early
10:15AA 4801 due to leave, no estimate yet
4 h between the gates, on these times
The last days
DL 571 and AA 4801 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.