FR 1307 then SN 3728 at Madrid
Napoli → Madrid → Brussels
Timetable, Madrid time
12:55FR 1307 from Napoli at the gate
17:30SN 3728 to Brussels leaves the gate
4 h 35 apart on the timetable
The last days
FR 1307 and SN 3728 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.