DL 507 then UA 3013 at Boston
Los Angeles → Boston → San Francisco
Timetable, Boston time
05:28DL 507 from Los Angeles at the gate
08:30UA 3013 to San Francisco leaves the gate
3 h 02 apart on the timetable
The last days
DL 507 and UA 3013 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.