AA 970 then AA 3931 at Miami
New York LaGuardia → Miami → Detroit
Timetable, Miami time
11:03AA 970 from New York LaGuardia at the gate
15:10AA 3931 to Detroit leaves the gate
4 h 07 apart on the timetable
The last days
AA 970 and AA 3931 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.