AA 1886 then AA 1260 at Boston
Miami → Boston → Chicago O'Hare
Timetable, Boston time
15:43AA 1886 from Miami at the gate
16:41AA 1260 to Chicago O'Hare leaves the gate
58 min apart on the timetable
The last days
AA 1886 and AA 1260 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.