AA 504 then AA 2937 at Charlotte
Boston → Charlotte → St Louis
Timetable, Charlotte time
13:54AA 504 from Boston at the gate
18:30AA 2937 to St Louis leaves the gate
4 h 36 apart on the timetable
The last days
AA 504 and AA 2937 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.