AA 899 then AA 970 at O'Hare
Los Angeles → Chicago → Philadelphia
Timetable, Chicago time
06:00AA 899 from Los Angeles at the gate
06:30AA 970 to Philadelphia leaves the gate
30 min apart on the timetable
The last days
AA 899 and AA 970 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.