AA 2851 then DL 756 at O'Hare
Denver → Chicago → Los Angeles
Timetable, Chicago time
10:30AA 2851 from Denver at the gate
14:32DL 756 to Los Angeles leaves the gate
4 h 02 apart on the timetable
The last days
AA 2851 and DL 756 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.