FR 3073 then FR 7543 at Barcelona
Prague → Barcelona → Manchester
Timetable, Barcelona time
11:15FR 3073 from Prague at the gate
11:35FR 7543 to Manchester leaves the gate
20 min apart on the timetable
The last days
FR 3073 and FR 7543 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.