AS 3121 then WN 581 at Denver
San Diego → Denver → Nashville
Timetable, Denver time
23:59AS 3121 from San Diego at the gate
08:00WN 581 to Nashville leaves the gate
8 h 01 apart on the timetable, overnight
The last days
AS 3121 and WN 581 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.