AA 4783 then UA 3534 at O'Hare
Baltimore → Chicago → Louisville
Timetable, Chicago time
12:59AA 4783 from Baltimore at the gate
14:30UA 3534 to Louisville leaves the gate
1 h 31 apart on the timetable
The last days
AA 4783 and UA 3534 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.