AA 549 then AA 2486 at Charlotte
Richmond → Charlotte → St Louis
Timetable, Charlotte time
06:18AA 549 from Richmond at the gate
12:20AA 2486 to St Louis leaves the gate
6 h 02 apart on the timetable
The last days
AA 549 and AA 2486 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.