AA 9909 then 5X 5605 at O'Hare
South Bend → Chicago → Louisville
Timetable, Chicago time
09:30AA 9909 from South Bend at the gate
14:145X 5605 to Louisville leaves the gate
4 h 44 apart on the timetable
The last days
AA 9909 and 5X 5605 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.