AA 1240 then AA 5478 at DFW
Detroit → Dallas-Fort Worth → Louisville
Timetable, Dallas-Fort Worth time
08:03AA 1240 from Detroit at the gate
12:06AA 5478 to Louisville leaves the gate
4 h 03 apart on the timetable
The last days
AA 1240 and AA 5478 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.