BA 4296 then IB 1321 at Madrid
Dallas-Fort Worth → Madrid → Düsseldorf
Timetable, Madrid time
06:10BA 4296 from Dallas-Fort Worth at the gatealso AY 5644, EI 5872, QR 7234, AA 8631
12:40IB 1321 to Düsseldorf leaves the gatealso VY 5407, AA 8629
6 h 30 apart on the timetable
The last days
BA 4296 and IB 1321 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.