AA 2423 then AA 3547 at O'Hare
Charlotte → Chicago → St Louis
Timetable, Chicago time
16:05AA 2423 from Charlotte at the gate
16:50AA 3547 to St Louis leaves the gate
45 min apart on the timetable
The last days
AA 2423 and AA 3547 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.