AA 643 then AA 688 at O'Hare
Los Angeles → Chicago → Indianapolis
Timetable, Chicago time
18:00AA 643 from Los Angeles at the gate
22:15AA 688 to Indianapolis leaves the gate
4 h 15 apart on the timetable
The last days
AA 643 and AA 688 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.