DL 3817 then DL 4100 at Seattle
Boise → Seattle → San Jose (California)
Timetable, Seattle time
13:00DL 3817 from Boise at the gate
16:30DL 4100 to San Jose (California) leaves the gate
3 h 30 apart on the timetable
Seattle’s board gives a departure time for only about 56% of its flights, so many days show no gate time.
The last days
DL 3817 and DL 4100 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.