UA 604 then DL 1986 at Houston
San Francisco → Houston → New York LaGuardia
Timetable, Houston time
06:32UA 604 from San Francisco at the gate
14:15DL 1986 to New York LaGuardia leaves the gate
7 h 43 apart on the timetable
The last days
UA 604 and DL 1986 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.