KL 984 then KL 1671 at Schiphol
London City → Amsterdam → Catania
Timetable, Amsterdam time
12:05KL 984 from London City at the gate
09:00KL 1671 to Catania leaves the gate
20 h 55 apart on the timetable, overnight
KL 1671 leaves 20 h 55 after KL 984 arrives on the timetable: more than half a day, so not a connection we count.