LG 3591 then FR 9015 at Barcelona
Luxembourg → Barcelona → London Stansted
Timetable, Barcelona time
15:30LG 3591 from Luxembourg at the gate
12:20FR 9015 to London Stansted leaves the gate
20 h 50 apart on the timetable, overnight
FR 9015 leaves 20 h 50 after LG 3591 arrives on the timetable: more than half a day, so not a connection we count.