AA 1020 then WN 8592 at Miami
Detroit → Miami → Nashville
Timetable, Miami time
09:15AA 1020 from Detroit at the gate
15:45WN 8592 to Nashville leaves the gate
6 h 30 apart on the timetable
The last days
AA 1020 and WN 8592 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.