AA 475 then UA 2844 at O'Hare
Los Angeles → Chicago → St Louis
Timetable, Chicago time
06:56AA 475 from Los Angeles at the gate
10:45UA 2844 to St Louis leaves the gate
3 h 49 apart on the timetable
The last days
AA 475 and UA 2844 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.