UA 3907 then DL 1986 at Houston
San Francisco → Houston → New York LaGuardia
Timetable, Houston time
13:20UA 3907 from San Francisco at the gate
13:45DL 1986 to New York LaGuardia leaves the gate
25 min apart on the timetable
The last days
UA 3907 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.