AA 9931 then UA 1141 at Miami
New York LaGuardia → Miami → San Francisco
Timetable, Miami time
09:52AA 9931 from New York LaGuardia at the gate
16:40UA 1141 to San Francisco leaves the gate
6 h 48 apart on the timetable
The last days
AA 9931 and UA 1141 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.