AA 440 then AA 529 at O'Hare
Houston → Chicago → Los Angeles
Timetable, Chicago time
14:29AA 440 from Houston at the gate
15:20AA 529 to Los Angeles leaves the gate
51 min apart on the timetable
The last days
AA 440 and AA 529 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.