AA 1801 then WN 4651 at Miami
Newark → Miami → Nashville
Timetable, Miami time
15:27AA 1801 from Newark at the gate
15:45WN 4651 to Nashville leaves the gate
18 min apart on the timetable
The last days
AA 1801 and WN 4651 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.