AA 712 then AA 2778 at Charlotte
St Louis → Charlotte → Grand Rapids
Timetable, Charlotte time
10:13AA 712 from St Louis at the gate
11:04AA 2778 to Grand Rapids leaves the gate
51 min apart on the timetable
The last days
AA 712 and AA 2778 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.