AA 320 then AA 1918 at Miami
Tocumen → Miami → Chicago O'Hare
Timetable, Miami time
18:15AA 320 from Tocumen at the gate
21:21AA 1918 to Chicago O'Hare leaves the gate
3 h 06 apart on the timetable
The last days
AA 320 and AA 1918 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.