AA 9602 then IB 421 at Madrid
Philadelphia → Madrid → Barcelona
Timetable, Madrid time
13:30AA 9602 from Philadelphia at the gate
18:00IB 421 to Barcelona leaves the gatealso IB 421S, LL 3021, VY 5122, AV 6170, QR 6971
4 h 30 apart on the timetable
The last days
AA 9602 and IB 421 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.