AA 6077 then AA 5073 at Philadelphia
Louisville → Philadelphia → Detroit
Timetable, Philadelphia time
22:53AA 6077 from Louisville at the gate
08:31AA 5073 to Detroit leaves the gate
9 h 38 apart on the timetable, overnight
The last days
AA 6077 and AA 5073 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.