AA 2891 then AA 2548 at O'Hare
Los Angeles → Chicago → Philadelphia
Timetable, Chicago time
18:50AA 2891 from Los Angeles at the gate
19:20AA 2548 to Philadelphia leaves the gate
30 min apart on the timetable
The last days
AA 2891 and AA 2548 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.