BA 577 then BA 490 at Heathrow
Milan Linate → London → Gibraltar
Timetable, London time
08:35BA 577 from Milan Linate at the gate
07:50BA 490 to Gibraltar leaves the gate
23 h 15 apart on the timetable, overnight
BA 490 leaves 23 h 15 after BA 577 arrives on the timetable: more than half a day, so not a connection we count.