AA 642 then AA 1640 at O'Hare
Los Angeles → Chicago → Phoenix
Timetable, Chicago time
07:05AA 642 from Los Angeles at the gate
13:26AA 1640 to Phoenix leaves the gate
6 h 21 apart on the timetable
The last days
AA 642 and AA 1640 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.