AA 2986 then AA 2347 at Miami
Denver → Miami → San Francisco
Timetable, Miami time
12:00AA 2986 from Denver at the gate
18:39AA 2347 to San Francisco leaves the gate
6 h 39 apart on the timetable
The last days
AA 2986 and AA 2347 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.