AA 671 then UA 3755 at O'Hare
Dallas-Fort Worth → Chicago → Louisville
Timetable, Chicago time
11:02AA 671 from Dallas-Fort Worth at the gate
16:20UA 3755 to Louisville leaves the gate
5 h 18 apart on the timetable
The last days
AA 671 and UA 3755 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.