AA 9950 then UA 4438 at O'Hare
Charlotte → Chicago → St Louis
Timetable, Chicago time
08:30AA 9950 from Charlotte at the gate
10:45UA 4438 to St Louis leaves the gate
2 h 15 apart on the timetable
The last days
AA 9950 and UA 4438 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.