TP 4399 then WN 1121 at San Francisco
Boston → San Francisco → Los Angeles
Timetable, San Francisco time
00:25TP 4399 from Boston at the gate
06:40WN 1121 to Los Angeles leaves the gate
6 h 15 apart on the timetable
The last days
TP 4399 and WN 1121 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.