AA 8651 then QR 3663 at Barcelona
Madrid → Barcelona → Milan
Timetable, Barcelona time
19:15AA 8651 from Madrid at the gate
20:05QR 3663 to Milan leaves the gate
50 min apart on the timetable
The last days
AA 8651 and QR 3663 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.